Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5e4acd28adcd1c…

MALICIOUS

PDF

72.5 KB Created: 2021-01-05 20:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: acd5aa71d340d7b2360b5966632618c2 SHA-1: b508d223c20d0b04f4c3c9dcea5322a5a38c1d0c SHA-256: cf5e4acd28adcd1cde3b8a3fa6e6f2905c15a7aa4049fddb7141562f71d53aff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://trafffe.ru/aws?utm_term=customer+list+template+excel PDF link annotation
    • https://cdn.sqhk.co/zupuguvawaj/jiVjdeP/mizipuvegufetizorimilu.pdfIn PDF document text
    • https://memupenenukef.weebly.com/uploads/1/3/4/5/134527104/6770481.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/tevoligawab.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/bUbfzjf/trials_frontier_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f89c6272e2bb.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/3jdhaDc/download_game_alien_shooter_lost_city_mod_apk.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/2390156.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/1676164.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/lijulijowivaze/9298607032.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/15702692994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d086b3-594f-48cb-b728-7c1f6aa30e92/steam_workshop_cs_go_skins.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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 5052 bytes
SHA-256: 4e2819aede4f5e18265432325815957e1ed8a0de9e91a6bcbdc635a16a662881
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 10104 bytes
SHA-256: 5dd7e68fd5dced5c4fabfeffacfe320bced7e5d041f30b6836d5b270b0176a57

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