Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfb71a2ea5963f8…

MALICIOUS

PDF

73.9 KB Created: 2021-01-25 07:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5deb82c696b774706801885572634b21 SHA-1: 2839db8c717a9bd070414a11b5c1e4e156bbaf2c SHA-256: fdfb71a2ea5963f869fab93616b410c547fbe124d9f2b0cce9e85980e298ecd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

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 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://trafficel.ru/123?utm_term=john+deere+snow+blade+mounting+brackets PDF link annotation
    • http://zijimesaxa.iblogger.org/autonics_at8n_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/fUibic0/68260447533.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/nuwupoxo_rukozupupaluk.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/jjBhhif/wheels_on_the_bus_bussongs.pdfIn PDF document text
    • http://sluzhba1.net/432014196896ow2d.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/RNsxEsY/71820560051.pdfIn PDF document text
    • https://kenafidoragakox.weebly.com/uploads/1/3/1/8/131856022/9e3c383371f.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/sanurixudo-zuwulorekixi-govofujepufaz-rugiw.pdfIn PDF document text
    • http://lazerepil.site/jesusadidetabikikuvafeawpm7.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/gcCgdxs/40109002024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ladorum.epizy.com/superlative_exercises_with_answers.pdfIn PDF document text
    • http://wikatefa.epizy.com/2411129741.pdfIn PDF document text
    • http://gozipoxux.rf.gd/breast_cancer_screening_guidelines_nhs.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/cheat_engine_6._4_softonic.pdfIn PDF document text
    • http://fozabenisos.epizy.com/kelojuge.pdfIn PDF document text
    • http://kojajopi.epizy.com/50606109608.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 5520 bytes
SHA-256: 9be1c1ad47843b29c16ec8d5177534d8b3fe792c338b6af00931b4c6bb06750c
font_01_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 10184 bytes
SHA-256: 07673e13fdec48040928ba1d8a908b49c34645c59cb7e42375d0b70f3d30d319
font_02_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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