Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b331f4f647cc58b…

MALICIOUS

PDF

74.8 KB Created: 2021-02-14 11:38:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2e90d7dbd9604f2c6a9db68504418c1a SHA-1: 6d3208ab4b1c628d35568f51e95ca0c33a553070 SHA-256: 4b331f4f647cc58bb0ecca27e3a9ba85fa30e2f39c80ed4343b1f2fa195c754d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, specifically as a phishing or SEO spam document. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=ben+10+secret+of+the+omnitrix+google+drive PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5ff4a6773f967.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/poromukupakate_dugegejukori_sixipeduva_bemet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_5fdfb90cb0b4e.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/jugefomuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc99d434801f.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jyicY7r/mediamonkey_for_mac_catalina.pdfIn PDF document text
    • http://nifibegiro.iblogger.org/chemistry_collision_theory_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_600516c342bc2.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/ruzodozof-lovunuzikeba-wuvaw.pdfIn PDF document text
    • https://vevofuxideg.weebly.com/uploads/1/3/1/4/131405958/luvexegexorupewomuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5fc697c3dd753.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/jitimesolagun/nibogunaverujapiselebot.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/fawenekinusijokadezirobu.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/89048557130.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 5596 bytes
SHA-256: b47df05eb9ef19f25a66f2cd31a3bb289fe91e238435eef6f8cb45da1b1ce9f7
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 10440 bytes
SHA-256: b96a509fcfe456c88b07ec982c0c8446a91c0787d45348f3c2f4f246d77119ea
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 16220 bytes
SHA-256: d03d139f342f51199e32b675a560d49bed70eb4e742c892cef63c23e01de9dba

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