Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e711cf48615752…

MALICIOUS

PDF

90.7 KB Created: 2021-03-09 13:30:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5dd42a8feeaf766dc29504ef3b89b6cc SHA-1: b2a7c045807c7d32e6bb8ce319473ed34ed05780 SHA-256: a7e711cf48615752482f7fe10c40434ae23f08c5b6fef15a64d499cb8d9fb0df
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, containing a significant number of external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=auroville+foundation+act+1988+pdf PDF link annotation
    • https://cdn.sqhk.co/ruwonumatag/PCcheib/versace_chain_reaction_red_white_and_blue.pdfIn PDF document text
    • http://guwixamu.iblogger.org/volume_app_for_android_phone.pdfIn PDF document text
    • http://xapozibun.22web.org/sezarudebuvutofokape.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hiiidrg/dead_zombie_shooting_target_3d_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jagcunn/16104169839.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/1239331.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/bjfgdFc/carmageddon_2_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/jjqFDPZ/fantasy_kingdom_defense_unlimited_gems_apk.pdfIn PDF document text
    • http://maporirunigis.22web.org/naguforemunovulizis.pdfIn PDF document text
    • http://buzifun.22web.org/bahaddur_kannada_film_song_video.pdfIn PDF document text
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/litenisakeweli.pdfIn PDF document text
    • https://cdn.sqhk.co/zimofuzam/1Tjb7ii/91934878271.pdfIn PDF document text
    • https://tatunuzaxu.weebly.com/uploads/1/3/4/5/134596213/274b3.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/egglkic/welimewetap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifobidurusidi.epizy.com/1st_grade_grammar_worksheets.pdfIn PDF document text
    • http://zojigevisafali.epizy.com/24027975890.pdfIn PDF document text
    • http://vizaraxeforuzu.rf.gd/10920143561.pdfIn PDF document text
    • http://katudajug.epizy.com/zebco_33_classic_manual.pdfIn PDF document text
    • http://janibiledepe.rf.gd/keguparamalar.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_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 5420 bytes
SHA-256: 466d38938189dfa59c4c817a2ad1515fca124d0573e149d37a2c9f84aeea3216
font_01_sfnt_off00013aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFF 10164 bytes
SHA-256: 9cff5211ea837b79549a19ad14cb71b71da35dec15cc85450758af5f6cba0a58

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