Malicious PDF — malware analysis report

Static analysis result for SHA-256 658359543c2b6118…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 20:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 74863bee03888109b270415862bd1279 SHA-1: 8caab494afc1a8135d7e36606fee73d869928381 SHA-256: 658359543c2b6118d5d072b1337ed228f5a3fe9bc34b3ac64a95da3bcc11a8f6
156 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 5

  • 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.
  • 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://lozipotod.ru/award?keyword=library+accession+register+pdf PDF link annotation
    • https://bafipiwefewojex.weebly.com/uploads/1/3/4/5/134576197/muzubawuf.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/aufmann_college_algebra.pdfIn PDF document text
    • http://sponsor.rest/wrestling_revolution_wwe_mod_apk_downloadar8wf.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/phrasal_verb_meaning_in_hindi.pdfIn PDF document text
    • http://parrrtner.xyz/193283338338nnph.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/81038250616pbwq9.pdfIn PDF document text
    • http://winoorama.site/free_worship_background_imagezjk2e.pdfIn PDF document text
    • http://fbdirect.site/43929940731s94km.pdfIn PDF document text
    • http://the-job.ru/motazinaxozugabk6u89.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/gekutovijanijelun.pdfIn PDF document text
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/movelotuj.pdfIn PDF document text
    • http://tumbaa.space/120737276hgsh.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/zeworibuzoza/ups_certificate_of_origin.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/16025785673.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/bollywood_movies_2018_links.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/18491326839.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/snapper_lawn_mower_repair_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/eldar_harlequin_painting_guide.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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 5476 bytes
SHA-256: be5467020e9d33401e2223453b61f0451144da0e3512cfb1342cde6643d5838f
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 11364 bytes
SHA-256: bd6a5b8623d96431ba641ba61bafacd4b90c2356d88d530dbfb84f4ba59dd819

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