Malicious PDF — malware analysis report

Static analysis result for SHA-256 317fc35508e8565a…

MALICIOUS

PDF

59.5 KB Created: 2020-11-25 08:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 131442300b3548bb89476e43d90ae620 SHA-1: b65064d8baf26852bca37c5e3ad6d8746636d987 SHA-256: 317fc35508e8565a6e4b37d08410eb11596dba84f232a7fc16b97911d258cc05
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=krugman+and+wells+macroeconomics+4th+edition+pdf PDF link annotation
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/4712967.pdfIn PDF document text
    • https://puvujoda.weebly.com/uploads/1/3/4/3/134326666/kokapixovi_tuduviduvire_julazuzoxe_mepotalipi.pdfIn PDF document text
    • https://jedapozopimu.weebly.com/uploads/1/3/4/6/134614290/f0d9035c02246b.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://gakupimofol.weebly.com/uploads/1/3/4/5/134583622/kuzuzox.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/2139992.pdfIn PDF document text
    • https://javevopikaze.weebly.com/uploads/1/3/4/4/134489205/4549528.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/dazuxujepov/bournemouth_council_tax_refund_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/the_diary_of_a_teenage_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50db75d9-264a-4c7d-bd45-b964337def54/5639053706.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/mibiguwabupatugubisaxupus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcda305-619e-4289-9d77-8e9dd272d45b/circuit_hydraulique_tracteur_agricole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6601f3-f085-4a2d-b056-eb3f6237e176/fetuwede.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_off0000a9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BE 5716 bytes
SHA-256: 51ae0c742c9e3f7ef173b31e797c5db0fc7c6c33c74b464f940e7270ac5b0886
font_01_sfnt_off0000bd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2C 10588 bytes
SHA-256: 461ab42c557772031cd2f392a796c3bfa7f47ea9236d7c4a209412f78cd6b5c0

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