Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e9aa000928c00e…

MALICIOUS

PDF

67.2 KB Created: 2021-02-23 23:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 29e17b6357e53c4c2c8e924a27de9a29 SHA-1: 908227602d9603c5847afc1c52ccd03002e90b86 SHA-256: a7e9aa000928c00ebe6ef664b95a1d4211fb137dfad983ec9868390a47518de7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=basic+genetics+worksheet+pdf PDF link annotation
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/3273496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_6024192d008e5.pdfIn PDF document text
    • https://cdn.sqhk.co/sazoteva/gjfFVOi/carnivores_ice_age_pro.pdfIn PDF document text
    • http://suzenax.22web.org/tally_accountant_interview_questions_and_answers.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/banexedakix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fe4f3b9de86f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fec34b752ba1.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/552da987e.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/jasadilurixoruguwos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_60055f4819c14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fcae53323257.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/kitofemediboxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fda437e4768e.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/itzbLic/84890898290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_603358e614c29.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/zalezatateviredal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5fd73c9b59c5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifepex.rf.gd/46776244009.pdfIn PDF document text
    • http://nuridoxiwe.rf.gd/pigexazexavelaw.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_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 5588 bytes
SHA-256: fc07d12b014b395a0820f097b0d78f84e899dc3b046be8347b20c22e421fde96
font_01_sfnt_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 10048 bytes
SHA-256: 6d1e5226cb6834a969e89501aeb63dbbc427dbd2acbbdeafac6e0c8a8afbbc58

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