Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8be807b57a622ea…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 21:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c62172af8aa56d112c7ae87f47818c0e SHA-1: 22e4486758eb9a52d46b9afebacc6b08507efcd7 SHA-256: b8be807b57a622ea1d814caa2d68d5d1a1b19b6402d0dcf9d5902251ea39a41e
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to distribute further payloads or redirect users to malicious sites.

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) or Microsoft license-boilerplate 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://bologen.ru/strik?utm_term=download+format+surat+lamaran+kerja+pdf PDF link annotation
    • https://cdn.sqhk.co/logubaxe/gihhVij/labyrinth_characters_fireys.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/dSYjjif/kick_the_buddy_2_mod_apk_android.pdfIn PDF document text
    • https://webeboxux.weebly.com/uploads/1/3/4/4/134493090/veregas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_605575ee6f870.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/gchiidP/juwawatukobowa.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/kja9jat/argos_white_triple_bunk_beds.pdfIn PDF document text
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/22fa691ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_604ac778ec3c7.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/WnjbhbJ/rotator_cuff_tear_therapy_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_60143483c6f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_602bdbfbb66b0.pdfIn PDF document text
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/lomedasul.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/iczOiiI/good_strength_workouts_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_4714c161e45c4096b3dc9bc496ab7d40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/xavobijogeropekipoju.pdfIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_d312a4d09e914fdc897066cae33a4e82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/74227243587.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_a74558b0d6c94c9384a3d6607a1393eb.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_d994c92b3fd94682909c0312a2d406a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/sony_bravia_32_smart_tv_price_in_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/cutting_skills_printable_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/total_column_google_sheets.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 5416 bytes
SHA-256: 519d2bd97d898ecd05a77aa8dfc854ff4770a24c986390b028cbe512b5efb97f
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 10532 bytes
SHA-256: 87d74fffd937bddefc2478cc3c224fa487a2d14ee7f4657a2f0feb5effda7fa6

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