Malicious PDF — malware analysis report

Static analysis result for SHA-256 d288dfbc360c0716…

MALICIOUS

PDF

67.8 KB Created: 2021-03-04 07:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 880c340e7703ffe084d3ba811b5827f6 SHA-1: def65855e115da0e3dbc9e26b074f5add16622b1 SHA-256: d288dfbc360c0716ba8d40c905fa9bb640e306cbea9ee6c1a1c925537f1a041b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=romeo+y+julieta+1875+exhibicion+no.+3+review PDF link annotation
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/julusavuxapo_kasavuj_xosozakefopeli.pdfIn PDF document text
    • http://gta-msk.ru/factorial_notation_worksheet_with_answerslbqrg.pdfIn PDF document text
    • http://godomun.iblogger.org/chammak_challo_chail_chabila_song.pdfIn PDF document text
    • https://derodukiv.weebly.com/uploads/1/3/1/4/131453370/posisoke-gerudojoga-janepuzejajo.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/jobetikinojaf.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/4347799.pdfIn PDF document text
    • http://eliyalte.com/husky_12_volt_inflator_reviews34mt8.pdfIn PDF document text
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/b26a11.pdfIn PDF document text
    • https://nawezuto.weebly.com/uploads/1/3/4/5/134595998/4872099.pdfIn PDF document text
    • http://lishop.site/java_aes_bouncy_castle_tutoriali1akz.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/godorobili.pdfIn PDF document text
    • http://lasleymarkt.ru/26322851238qqxe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogigipoja.epizy.com/how_to_pack_up_the_graco_pack_n_play.pdfIn PDF document text
    • http://kabewusibun.epizy.com/bicycle_thieves_mp4_songs.pdfIn PDF document text
    • http://zonadomafi.rf.gd/formiga_alienigena_mib.pdfIn PDF document text
    • http://titasukutisun.epizy.com/sad_cartoon_gif.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/mishima_guide_persona_5.pdfIn PDF document text
    • http://buwozefavimim.epizy.com/rikepudubodipekepokol.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_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 6052 bytes
SHA-256: 95c40298d50ddf647ed9f45b4c1d25d64c570b7aa16bf25a9063652b1ece27ce
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 10528 bytes
SHA-256: 78863f38985ae8f447b71822f898c74a9b7bf32314de1fda05545ad51eb427b6

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