Malicious PDF — malware analysis report

Static analysis result for SHA-256 046162cc9d7a88ae…

MALICIOUS

PDF

74.3 KB Created: 2021-04-01 11:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa9249365046f65f91ae12bf9cdd96f9 SHA-1: 5a40c72fd6c72cb9dc7234035194e64bfd952a6c SHA-256: 046162cc9d7a88ae328fd9fe0bda0133c192a99036f61a3d5369d66bd2b2cb94
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 0.9998

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://zajinet.ru/award?keyword=bodybuilding+workout+routine+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff017c939e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_602b604cef002.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/iLjfehe/34422394542.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/FjbxLRd/fejemerixukagenoka.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/aflatoxinas_en_cerdos.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/gfP7hda/leruvajiku.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/fkgjtlx/korojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5feb246427dc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5fdbc5c3d9a59.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/i9ig6zF/14389338930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_c7f1d54085ab4f7da177ab71c89f0048.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/75019025884.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/kikotivazepuvaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/1001_arabian_nights_free_download.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_02777212950842e6b122f42c853ee96d.pdf?index=trueIn PDF document text
    • http://ligujizulogi.atwebpages.com/xonukatutimafofunixira.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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 5268 bytes
SHA-256: 99c08bc2c9427faea19a1516bf0494f71c8252c5b15353d0960899711a84a832
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10232 bytes
SHA-256: 977a85ac9c929b1604c5e754843713796288f507670cac1a772b742718c87138

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