Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb85643afb296db…

MALICIOUS

PDF

64.2 KB Created: 2020-12-14 21:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: add50783d87b61dd3e090d48ad15685d SHA-1: e96c71ece12395d0c23f9a6ee3e0bfa6fa716466 SHA-256: bbb85643afb296db8e5acd73af5360ceb5c1a85bfeee7ffb7d5f986501c5ad86
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 pointing to disposable domains and potentially malicious redirectors, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. While no scripts were extracted, the overall structure suggests an attempt to lure users to malicious websites, likely as part of a phishing campaign.

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://traffset.ru/123?utm_term=barclay+commentary+set PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fbd2dc438369.pdfIn PDF document text
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/luturune_xepufivulatiwuk_gapubofegimos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_5fb50d81ba82a.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/4351008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_5fb4cee40ee15.pdfIn PDF document text
    • https://niwewuvikade.weebly.com/uploads/1/3/4/6/134629185/533281.pdfIn PDF document text
    • https://xiwapidijiz.weebly.com/uploads/1/3/4/5/134511693/482580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_5fa53ae7b42a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5af5f12facd59cecdbb78/t/5fd70fb35488895576c35add/1607929785975/art_in_america_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/answer_to_picture_riddles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2a6c52-21d2-4c75-8143-37d4bac00c40/pebopoxilebonopajezidiw.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/87509361333.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/t_shirt_collar_template_design_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_off0000bf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3F 5096 bytes
SHA-256: 89769721c238670b442ceb0f27df752c51b9ea1c7795d9bea880b2701cfe51bc
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 10456 bytes
SHA-256: eac604c1ec8cdddb8e5eb6de0b698619158c514d21c507ee7425d57c97862097

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