Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c18ac3e1f685ec…

MALICIOUS

PDF

80.5 KB Created: 2021-05-12 09:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 716ddcd06afe967e32e3a2dbb6754a30 SHA-1: 4f15ea96b07d616079338c6ba892a12ff8c3d44e SHA-256: 69c18ac3e1f685ec63b389eb6e1dff87a5712d98e900f6f0352227d44d7788b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. One of these links, http://bitcoinchat.fun/vegitarinulusmn2b.pdf, is likely part of a malicious campaign. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it's a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=2007+jeep+grand+cherokee+diesel+specs
    • http://bitcoinchat.fun/vegitarinulusmn2b.pdf
    • http://mazanatur.space/199372420997xozm.pdf
    • http://hs-life.ru/18742240618stdh1.pdf
    • http://drilltech.info/petty_cash_balance_sheet_expense7k17v.pdf
    • https://cdn.sqhk.co/xuxofidipo/jgKlcjc/74027116352.pdf
    • https://cdn.sqhk.co/busosuwik/DgcRZhd/helicopter_gunship_strike_apk_download.pdf
    • https://cdn.sqhk.co/nuvexajamu/jgtohee/begejuk.pdf
    • https://cdn.sqhk.co/zotiperugi/gfc0Mie/joxizuwubemisixara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tezibezob.epizy.com/all_garfield_comics.pdf
    • http://kewumexor.epizy.com/kicker_hideaway_install_manual.pdf
    • https://s3.amazonaws.com/lemerisinivum/bootstrap_4_navbar_template_with_logo.pdf
    • http://zazozipuse.rf.gd/viraxakojedatovaruxasa.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_689667af8b944a9b96a4839574df2a5b.pdf?index=true
    • https://s3.amazonaws.com/tazopaju/kali_linux_revealed.pdf
    • http://giwoxut.rf.gd/pronunciacion_abecedario_en_ingles.pdf
    • https://s3.amazonaws.com/bipovoromoj/8888659274.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/microsoft_active_directory.pdf
    • https://s3.amazonaws.com/xapidajovaji/rekiwakemirovabaw.pdf
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_40fd3fd449e74178bbd56ada26128323.pdf?index=true
    • https://s3.amazonaws.com/vizegemawokaxe/actionscript_2._0.pdf
    • https://s3.amazonaws.com/vovuzize/labubevidufopogebit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5d.bin
a0234eb315a8a2b178f4c8161cda2217bf37afa1774705306a6948058f56e9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 5732 bytes
font_01_sfnt_off000110ed.bin
00ebef3143da1b1a9ba96c42b075a98f2ff1b4b8ae0c68ef457d8d78effa12c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 10460 bytes

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