Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac7c67da087ec36…

MALICIOUS

PDF

89.8 KB Created: 2021-05-23 22:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c1026334c06aa668d426a50104b15588 SHA-1: 2aaa902507bfeb2bd3ed75812905ef43e0924d37 SHA-256: aac7c67da087ec369817f9b161e362fc9203a8f961764d0e507bdbad58a1a342
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests a potential distribution vector for further malicious content.

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://druttle.ru/strik?utm_term=shards+of+honour+epub PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366010/normal_6006738b34a4d.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/jekafepagugore.pdfIn PDF document text
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/6764820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fe9f778a5916.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/4301075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd636a5b4509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_601ef19d2e2e5.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/fozitolusovado_wujodese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_603ee47e86fc4.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/c69971cfaeb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5febd229e9924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6064a40b39a34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fcaf3c1069e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_600aa0ed6abba.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/tametete.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/figidireki/71017607183.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/suffolk_county_boy_scouts_merit_badge_counselors.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/tuturuzokeximozilele.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/celtx_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/comprehension_worksheets_grade_4_free.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_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 5340 bytes
SHA-256: 865e5d98c03a0be1b7146274adf2419d8779c5c3f7acbcc744bae49d26bba1e8
font_01_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 15780 bytes
SHA-256: 510e22cd505b5c45a814a869a15866061112dbfb20d107e167492f6f4f1c76ad

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