Malicious PDF — malware analysis report

Static analysis result for SHA-256 df26fdc958195387…

MALICIOUS

PDF

71.2 KB Created: 2021-02-12 22:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7a2b6502fa0a0fc1267323f04b06c77c SHA-1: bc3476fe6335051486a124b4200f2bff89d66590 SHA-256: df26fdc958195387ac20076661d815ae06afa9ad28d41270d49ab2a4ca8dba63
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/wix?keyword=halo+4+jetpack+controls PDF link annotation
    • https://cdn.sqhk.co/towinomer/hfShcib/world_war_3_european_wars_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/Jghigjh/sadudotar.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/b2ijjfm/58300061819.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/agiefb3/xoresiniwodeve.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/ribegosasumozo_dorir_mewolulebavet_sumunuxelupes.pdfIn PDF document text
    • https://tumirovuwepilu.weebly.com/uploads/1/3/4/6/134603677/1cf893.pdfIn PDF document text
    • http://detonic-deutschland.website/825968554733nghf.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/cQjpxjz/36174933270.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/47Pjbhe/59960047545.pdfIn PDF document text
    • https://ludutaxe.weebly.com/uploads/1/3/0/8/130814402/vijapezi.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/jcgfjiI/superhero_heart_run_2020.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/267f03f01.pdfIn PDF document text
    • https://dexisuliraj.weebly.com/uploads/1/3/5/3/135346252/lebit.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/4908880.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/gZdgdih/ocean_rift_vr_review.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/Sjd2jaz/wallpaper_for_iphone_ios_12.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/vuxagixil/risafowuvobowe.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/17469177409.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/ideas42_impact_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/63548008100.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 5116 bytes
SHA-256: 3198d0e6c48675fbfd1c7e46c896b5e17cc387096733717d8ef46628955ef13d
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10668 bytes
SHA-256: 0499b64227947c34ddc76f959c3b6ea720985f0f9efd80e45445b7e5837a5d89

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