Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e13813561b68c84…

MALICIOUS

PDF

65.5 KB Created: 2020-12-23 02:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b6886894b134373e528f00ccbfa7dfdd SHA-1: d83e0cb476217b9b993ea087225f17fc80df1812 SHA-256: 6e13813561b68c847ec603eb657272cb1cf610b36d54e19195589e21b9918b7a
186 Risk Score

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://traffine.ru/123?utm_term=corresponding+parts+worksheet+pdf PDF link annotation
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/7c4167.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/3107047.pdfIn PDF document text
    • https://votusaponepo.weebly.com/uploads/1/3/4/4/134471583/delavapesesisurekevi.pdfIn PDF document text
    • https://terobatef.weebly.com/uploads/1/3/4/3/134397950/1d1d9c416d91f06.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/guvisalusivaw.pdfIn PDF document text
    • https://difekubo.weebly.com/uploads/1/3/4/7/134714923/9fe02234f9a.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/kugigo-dilalukel-parovivojibuz.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/tixupidon-dimugub-dusufadigazoxi.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/davegawiki_zomaruluborije.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/wisatutadi/31882051156.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdefc73570fb44d1c81ebc/1606283207849/reviewing_biology_the_living_environment_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd546437a75c289d599510/t/5fddb2897514fb3b7634a2a3/1608364682305/tubosuparu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfcf47f67c863bcd18c9eb/t/5fe0f039bb3dbb3a40d005a3/1608577081514/mega_filmes_hd_apk_2._1.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/20833831695.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_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 5332 bytes
SHA-256: 3b21244019ea3cd362c9bcdf8c9aceeea59ce29b8f01d26113ba89560742361d
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10152 bytes
SHA-256: c2c0e52914cbf05e55d29abeabc57709a47b6b89449a0f062f096acd1d74530e

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