Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d51539312571d52…

MALICIOUS

PDF

83.4 KB Created: 2021-02-20 17:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ac46bb5735a2861ef9679ee10f29a5c SHA-1: 2e8b6b1868927aa740205e12223f20b3e1ba8ff2 SHA-256: 8d51539312571d52afaf33617f580a8a74cb03d5829ab07b745c81199d892e78
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-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://maypoin.ru/wix?keyword=mattress+vacuum+bag+home+depot PDF link annotation
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/19df879b24.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/mobazugikurifin-semigawufuren.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/manowe_fukozapofo_kudenu.pdfIn PDF document text
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/6e72f.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/d6b9432d0c661b.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/2ecb9294.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/ghyNZs6/spellstone_mortagan_guide.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/petubapizo/93255738319.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/carlos_sabino_el_proceso_de_investigacin_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/78727002764.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/33769223889.pdfIn PDF document text
    • http://rozepon.rf.gd/16930479298.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/jalebi_game_answers_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/5887440688.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/megizinidaxodexaj.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/9136973530.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/lorupemenazinitub.pdfIn PDF document text
    • http://sulipirakiran.rf.gd/meow_meow_cat_song.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_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 5660 bytes
SHA-256: 2d2b6bd430f13caf57113c04df232a0ce89bffb93eae809ee18b73bd57ba9f1a
font_01_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10840 bytes
SHA-256: aba309196230e5e0289bc48c1fbd24eb31076de1ed50c871317aeb779ec09b4e

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