Malicious PDF — malware analysis report

Static analysis result for SHA-256 3251f18d500e8a83…

MALICIOUS

PDF

71.6 KB Created: 2021-06-14 08:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20a9dabed2cf2900733d8cafae5432ba SHA-1: fb10e0b2bd0f21d90e4fe4d34be8255c747e5724 SHA-256: 3251f18d500e8a83fa9a30f0715d6bd347f4a138dde7bc01cb271707ec88ebd2
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://medvor.ru/pbw?utm_term=near+miss+in+construction+site PDF link annotation
    • https://xubawiki.weebly.com/uploads/1/3/1/1/131163512/3353726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_603b1fd764dc6.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/xeposoluliw.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/be4bd448915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_600e7c944ffb1.pdfIn PDF document text
    • https://xadifera.weebly.com/uploads/1/3/1/4/131438156/4aa65446e26ff73.pdfIn PDF document text
    • https://vufodasab.weebly.com/uploads/1/3/4/6/134639116/6459b0cce381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_60568dda8816d.pdfIn PDF document text
    • https://genolawibiwiz.weebly.com/uploads/1/3/4/3/134316454/c9c1897.pdfIn PDF document text
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/369144.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/dovenajoxoze.pdfIn PDF document text
    • https://veropomoveda.weebly.com/uploads/1/3/1/4/131453256/3203768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427548/52573897352.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/drinking_beer_and_acid_reflux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ece20ce-5c41-4f36-bad6-cb12762f4c66/34007378955.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/w/file/fetch/145235106/85036912082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcad4823-9b96-4e1b-930c-83087742f83b/how_to_open_a_sentry_safe_with_combination_3_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee1fb84-4141-4ffb-b4b0-d21800f9ec5f/vezagirajixanarokel.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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 4880 bytes
SHA-256: a208d860c2ec4181dc33a66fdd555f25c12c67dfffe294f65d72ebed397b270d
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 10532 bytes
SHA-256: a31828776d4a2e4c01281885fc62277bc17a3a5726484c21d703a4748ed92fe7

Open this report in the interactive analyzer, or submit your own file for analysis.