Malicious PDF — malware analysis report

Static analysis result for SHA-256 962b79343dbf1d06…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 06:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5fca7346ecd2ab74c39ed5424c2493e0 SHA-1: cfc3d7c9acc9ed1be6ac1090f568bc976dc61e20 SHA-256: 962b79343dbf1d06239087a5394c65130ec6d33b82ba931b2f7a97bec15f0574
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lozipotod.ru/123?utm_term=que+tipo+de+pan+puede+comer+un+diabetico PDF link annotation
    • https://cdn.sqhk.co/sisagoku/uggcicD/xewax.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/dixole.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/rusiduzopuzis.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/3jdliab/stick_war_hacked_game_download.pdfIn PDF document text
    • http://watogoda.mypressonline.com/47117604284.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/bd3gcoT/diguwabobigoxopek.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/zezukare.pdfIn PDF document text
    • https://tavugalijob.weebly.com/uploads/1/3/1/1/131164394/f6b3f298.pdfIn PDF document text
    • https://cdn.sqhk.co/jafakitiw/hNbJjft/27409134676.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/jhjhfgh/download_world_boxing_challenge.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/khBggif/clue_game_characters_and_weapons.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://radiviwix.onlinewebshop.net/peterbilt_mechanical_engineer_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/fusionner_plusieurs_fichiers_sur_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/loranuliwabixerekelat.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/22004288593.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/vixemifexomikifuxufigi.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/charles_bukowski_donne_libro.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_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 5208 bytes
SHA-256: 40d9a521c05a9a070f734c555051be2251ba0dfde14d0960b0b40380306db430
font_01_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 11852 bytes
SHA-256: 121a73447b44b5d3919137bf66f804785ec83da5c891d2ba303b342564f1242f

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