Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49e40353f3099e3…

MALICIOUS

PDF

70.7 KB Created: 2021-06-07 20:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2b73369a4f0065e71804721e37d3bcef SHA-1: 2668b90cb64bac360193b61bf9f5f694ad00708c SHA-256: a49e40353f3099e3afb5099fafe5efa48bf4672e64cf980d1ae676aafadd0074
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://pixomot.ru/pbw?utm_term=what+is+an+informative+essay+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453134/normal_604f2bd0ba3ed.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/91ba766e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fce02c9e9b1d.pdfIn PDF document text
    • https://volikupiwete.weebly.com/uploads/1/3/4/6/134676366/c9c24466629f.pdfIn PDF document text
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/vebujibezu_dowafid_veperakakiwok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_60468997db0de.pdfIn PDF document text
    • https://teguzefememefa.weebly.com/uploads/1/3/4/6/134609716/1767933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5ff88523d5048.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/dusuzomejazipi-dodujome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_6018d222cc671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wimarolos.pbworks.com/f/71018052204.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/how_to_update_a1_smart_watch_manual.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/stannah_600_fault_codes.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144685380/how_to_program_genie_7055_remote.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144417906/39643337495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc2b88f-1683-4e8d-9115-115be6905b65/13310376457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42dfc64b-5528-4580-b163-1262197166f0/how_do_i_change_the_toner_on_my_brother_tn_630.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 5384 bytes
SHA-256: c9153bc7d4e77de8754c247333f14d3ae337a01d86e9abdec7096340b2170eb1
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10356 bytes
SHA-256: 29142e1dba1a0539f441709e12163b01aaadb88e84e3ce5c3fa12e2a39c7f9fc

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