Malicious PDF — malware analysis report

Static analysis result for SHA-256 b837d07120504467…

MALICIOUS

PDF

87.9 KB Created: 2021-05-15 21:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4e74dbd76354fd4e56aa387029e711a7 SHA-1: 5a508d144494248cb91ec9287b841a8f26926ffb SHA-256: b837d07120504467ab9313acda0f8e0860990f2e38a7e9e906cc0d88ebeec8fb
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains text related to applying for a disability pension, which is a common lure for phishing or scam operations. The presence of multiple external URIs and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=how+to+apply+for+disability+pension+in+andhra+pradesh PDF link annotation
    • http://futamubizobov.iblogger.org/jemuwug.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/93f595c9a72d.pdfIn PDF document text
    • http://ruwexidokikisi.22web.org/rowusok.pdfIn PDF document text
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/07a6146c.pdfIn PDF document text
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/kisulapubufa-sazoj-losole.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/eb4b7e16818b.pdfIn PDF document text
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/door_arch_formers.pdfIn PDF document text
    • http://lotemosunuw.iblogger.org/canadian_citizenship_exam_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wekotegilufa.epizy.com/asuhan_keperawatan_penyakit_jantung_koroner.pdfIn PDF document text
    • http://lumaradidufil.epizy.com/the_master_swing_trader_toolkit.pdfIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_7e616e47433b4592bfab95b80215d484.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_26a25371791345f2b8180da03cd0e0f3.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_1d1c2dfa893f48dcad3ae43de21eb034.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_6b10278a0f954cf3a7aeb073e6eb5ae5.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_e89e9de016f64fdaa2998cad8702fd60.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_adcc8711d7354c23a346e78e67a37721.pdf?index=trueIn PDF document text
    • http://babefuv.epizy.com/5555135960.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_590847a54b3148ba93996c33d5e23eac.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_5b1f6cbfe047449cbd5a405a84e4e4c5.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_9e4dbcf78a804be389c3ae58a862d42a.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_a87de67c282f4638a8b1e9d505d69775.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_0ff8b2d048864ebc9e02ec69a40ef486.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_33a5728fbd8c4863b7b3edfceb42343b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 5212 bytes
SHA-256: a13d40b26fd78a8b0fc50127d20dc0bc7325fdf6c2882fc0fb6e7cf0cb32644e
font_01_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 11068 bytes
SHA-256: 01d4f5dac41844ecf062ea06b0f37e9acf7ccd8ffba9033f4cc254961f1039ea
font_02_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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