Malicious PDF — malware analysis report

Static analysis result for SHA-256 d926a90ccb84b209…

MALICIOUS

PDF

83.8 KB Created: 2021-03-18 10:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3ba4a71ca8192df58d2ce19aed0c7506 SHA-1: d59d192019e2effa7bfeaec4c683bfb829e5df2c SHA-256: d926a90ccb84b209b92425017f031807501362d1fc541b11ca6792eda22d9fee
206 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://xajibur.ru/123?utm_term=basara+2+heroes PDF link annotation
    • https://cdn.sqhk.co/modonasuje/hihdghm/38252013177.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/7364e7f8963.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/355eef652.pdfIn PDF document text
    • https://xabisemegebo.weebly.com/uploads/1/3/4/4/134491474/kotanowabijoj-kadamar.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/jbuEDxO/android_radio_nova_launcher_alternative.pdfIn PDF document text
    • http://milanomoda-italy.website/3gp_baby_laughing_video_freerwsww.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/ahjMIif/tipobataxiwepaluzav.pdfIn PDF document text
    • http://mavito.online/traducir_al_espaol_gratiscgc8a.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/2lTihbP/tile_stores_near_me_open_now.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/uphbJic/pac_beehive_springs.pdfIn PDF document text
    • http://maxist.ru/realidades_2_capitulo_1_b-_3_answersc0loh.pdfIn PDF document text
    • http://reduslim-italy.site/569609939885mpxj.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
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_0459a4d8ac9b4d86b299c9ee52d84c17.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_889bd889d77a4f6aae2d0b5f30757e1c.pdf?index=trueIn PDF document text
    • http://tolamepaduxeju.rf.gd/descargar_baidu_root_apk_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/benujixudovasonola.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_7eb9af19627749dd941831782d8e10bd.pdf?index=trueIn PDF document text
    • http://kusajonopabojos.rf.gd/bag_of_visual_words_python_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/badoo_premium_apk_5._61.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_73363a5828a447d59e256b61063efff1.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_20d0a668c5d6489c824b1b5431b334ac.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_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 4476 bytes
SHA-256: 5431f94b670e2da49fa0728fd2a93671df8c1de83bed853b10847ba3d95dd9a4
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11448 bytes
SHA-256: 902e8b84e4400841a142d1c165aecbdc422875fd0fd2eaf82648f7064cdf6370
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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