Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f950ec0401c420b…

MALICIOUS

PDF

82.8 KB Created: 2021-02-15 00:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df567f3abfb57b81d7f7a94ec01f0160 SHA-1: b2b945b1a4d7fead145b8d1f0e73f64b07169e2c SHA-256: 8f950ec0401c420b890f0d677b93a8f060421871fa1e740177049e6ff2cffc69
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-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://maypoin.ru/wix?keyword=dewalt+miter+saw+laser+washer+guide PDF link annotation
    • https://cdn.sqhk.co/ratevusur/jxSQD2a/jowajawosapage.pdfIn PDF document text
    • http://damodudajipofem.22web.org/23005879537.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/aiz7Gal/99073843128.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/cvuijhi/73547200786.pdfIn PDF document text
    • http://help-violation.com/kindergarten_math_gamesrywia.pdfIn PDF document text
    • http://trells.space/kojosegidinitasevabagekafnzb.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/Ehbhhhf/wizabodifapeta.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/gdhg7H4/cute_animals_wastickerapps._com.pdfIn PDF document text
    • http://fashion-deals.xyz/thoptv_for_android_smart_tvf3bok.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/narakugivodu_luzudaji_zuxubax_gufujafux.pdfIn PDF document text
    • http://xeeewq.xyz/emsisoft_anti_malware_portable_freel938n.pdfIn PDF document text
    • https://xifuforemavu.weebly.com/uploads/1/3/1/1/131164534/4164fc73c243.pdfIn PDF document text
    • http://aycotoro6.xyz/zizojzbijq.pdfIn PDF document text
    • https://cdn.sqhk.co/vakamuzawa/kjifgeK/48572529852.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/wixatax/42286730744.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/vodebivoriga.pdfIn PDF document text
    • http://nopatiget.epizy.com/25076025731.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/4liker_apk_free_new_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/gratis_avast_terbaru_full_version.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_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 5328 bytes
SHA-256: 00f28d8fd6fcbd254bb2f7688a79651db6907e51251d57bef8786705ac2e433b
font_01_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 10916 bytes
SHA-256: b6b5f7b0e4c55b1c5d1b1f0d35257bbba8931aa034f36be675bf24c0952b1779

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