Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b938be698872c1…

MALICIOUS

PDF

80.4 KB Created: 2021-05-12 09:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 726dc59fa3e45e29089ac722453c6e73 SHA-1: 3812ba4178377424e8d9c774b9728ad0536ee307 SHA-256: 00b938be698872c1f47682879c4104a37c84c19caf1d7bdedeb422d84dd8ab38
194 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 link farm. Several heuristics indicate this is a malicious PDF, including ClamAV detection and an ML classifier flagging it as phishing. The document body, though partially corrupted, suggests a lure related to repairing a slot machine, which is likely a pretext to drive traffic to the linked sites. No scripts were extracted, but the presence of numerous external URLs points to a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/strik?utm_term=how+to+repair+a+bally+slot+machine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368758/normal_5ffb05e68950a.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hdCgi8L/dawuretawovawi.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/jiNFtid/business_card_template_for_microsoft_word.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/iegcZSv/28650886040.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/2198020.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/Rd6jduD/ampere_meter_square_is_unit_of.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/a2DE9hd/no_man_s_sky_derelict_freighter_multiplayer.pdfIn PDF document text
    • http://mx50off.pro/nelson_grade_11_biology_textbookdg52k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5ffcb8027817a.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/paman_tetumi_nojaw_bibelasaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6013ca6654b77.pdfIn PDF document text
    • http://retys.fun/ronujopapujf21t.pdfIn PDF document text
    • http://topplafond.xyz/what_is_avrt_recoverylb5wm.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/gdRgEid/63381275135.pdfIn PDF document text
    • http://kafikupalukali.22web.org/32433678007.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/bidhMjb/vetasipamubotagudolopuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jobolekul/jb8igO8/check_your_credit_report_equifax.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/289958.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/Xn6Ywgg/nail_art_designs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5fd0e4005dfaf.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/26376811bcb9.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/cN64wjc/archery_master_3d_mod_money_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekegax.epizy.com/marketing_communication_meaning.pdfIn PDF document text
    • http://powipuwefitori.rf.gd/kemesumepexovomokitopota.pdfIn PDF document text
    • http://figapow.epizy.com/adobe_air_android_games.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_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 5468 bytes
SHA-256: 93931ba7ea6eba29381f11c122c18f602b60ccf4e4e4159b1c5300424a2f4a83
font_01_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 11388 bytes
SHA-256: f1eff829157549e6024f6ba04e9d168a5e9df13fcca01f4881b1b5726503b4bc