Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dbc92ce4c167e0…

MALICIOUS

PDF

69.1 KB Created: 2020-12-06 17:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5021da7884a1b9f913f98bc4a14f8bfe SHA-1: 14399cce660e728211bb6eac44848e4f05cb707d SHA-256: d9dbc92ce4c167e0d81647e830114450785061afa7d044fa48c8d5572180b598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The primary IOC is the URL 'https://traffset.ru/123?utm_term=potty+racers+5+y8', which is embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=potty+racers+5+y8
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fc1deb919ceb.pdf
    • https://static.s123-cdn-static.com/uploads/4449984/normal_5fcaae1f9efc3.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5fa500d1c507f.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zupojez_zipufukenoxowa.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fa3d67c4446c.pdf
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fa12a412cdca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84f36d21-aee8-445e-8498-5b8396c5bcaa/lafitabazijulamitoza.pdf
    • https://s3.amazonaws.com/tajimipojimo/vapuwelalarigiloxiritune.pdf
    • https://uploads.strikinglycdn.com/files/caaa8422-c218-4309-ab8f-7558a5ed8875/new_xxx_video_2017.pdf
    • https://s3.amazonaws.com/mutirexa/lonely_planet_guide_vietnam_cambodia_laos.pdf
    • https://s3.amazonaws.com/sugaguxagu/thermic_effect_of_food.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38f.bin
8e854c94ebc055668f38c95e9908de93c303c536825b79770f29262915b09af3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 5180 bytes
font_01_sfnt_off0000e546.bin
42ce4e670f85f2e534e6221bd15565a88b1c36a60009994d735379c1442110f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 10408 bytes