Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b4780a784fcbb3…

MALICIOUS

PDF

81.1 KB Created: 2020-12-21 17:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8de143db41e1e848e4279b06cd1fae06 SHA-1: 8a1608cd29ff70a4b858dada2c34a1cedbfe8be1 SHA-256: f9b4780a784fcbb3174c40f8ec3016773f9eeffee7330f8e008a8e9613f36540
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farming or directing users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to a Weebly hosted PDF. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=openfoam+programming+manual PDF link annotation
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/2a8b2fa.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/5442075.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/sokuvubosobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5fc838df5fa1d.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/kutam-zofipopelizag-wodinekate-zesivumoza.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/8747099f25972a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fd890a220cc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/s_f_49ers_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/artist_licensing_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/chicken_biryani_recipe_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/ahorn_blattform_beschreibung.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/33674631799.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf62527acac6192ab8c04a/1606378067725/wujasupomumuvevi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5230124b06a7eb31af4b6/t/5fcd08d3920f47545b980239/1607272660025/8373081014.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3426faffbf90a66f9ae2f/t/5fc3b0b8e18c5c478e6c2ef7/1606660280726/pavebumixudawiludago.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_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 5068 bytes
SHA-256: 5142d75331b6f4e29010455ae8586f10142993af40b2300c85c324d3de65daef
font_01_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 11504 bytes
SHA-256: 9689237cf32213ad5a3e5a80c7772d9c24c44f010cf008da6c1668245dac1e6c

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