Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f918a94bbdc527…

MALICIOUS

PDF

85.0 KB Created: 2021-03-22 00:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 36d92d9cd49904d2e5c9114c25e63894 SHA-1: 8917eb71488a689e827a4bb89c0dd10df1ec3ed2 SHA-256: d9f918a94bbdc5278305b4e3abdf560e08751b9fb40e47a7451395b3ae5ef723
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9994

Heuristics 7

  • 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.
  • 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://botokaw.ru/123?utm_term=nespresso+coffee+machine+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/betewulo/clf6ict/puwapitukarizamow.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/voxinodanidaxugukor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5fd76dfe40925.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/newotedaxijiwoz-woxemezejariku-nimegesopej-kuxew.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/gj9dgiK/halloween_wallpaper_desktop_aesthetic.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/gciaeue/wuposusumabosemex.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/phone_claim_affidavit_verizon.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/fLoyiis/87822511973.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/hggjaGU/download_game_faily_rider_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_60271cce7e752.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/fLAIFei/temaronug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fc7f315a5e56.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/76014448056.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/65255178421.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/98250337928.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/Oibgcji/gozidokopaxusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5fc590e84e5cf.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/7b3c945dee4cbd5.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/2002_7.3_powerstroke_transmission_fluid.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuburi/i6gehau/briefing_paper_topics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekolutewubel.myartsonline.com/pioneer_deh80prs_review.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/briggs__stratton_vanguard_14_hp_v-twin_manual.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/38750156746.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_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 5224 bytes
SHA-256: f5b5618cbca3449d34ce581b63fd64c0afa632dd37c4cdba62cc07d5518d9415
font_01_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 11072 bytes
SHA-256: 31b6b3f063390e36fd3d22407656e6a131f2d22064bbc505d6b3073014520bf3