Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bb60370dc8f88e…

MALICIOUS

PDF

72.9 KB Created: 2021-02-26 11:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 72882abdd204b15205f77af0f5faac59 SHA-1: 2896d695dd5f1460a1c38b960a5d9fbea55553c8 SHA-256: c4bb60370dc8f88e350495e104e07da657ebec9085a52cf2a9a112752d509da9
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 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=do+ups+ship+internationally PDF link annotation
    • https://cdn.sqhk.co/zaperarori/fxq7jaP/monster_evolution_merge_and_create_monsters_inc.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/woponemuwixuj_mekamidifem_sugaf_dusuxow.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/kapuxewidoka.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/zejaki.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/9797881.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/surodedarux.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/1ff0ff89.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/nhjjahh/31006021352.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/jifosaxifelitenu.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/tutorowebizuduvukubikoxo.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/sevirimisexigad.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/AXsQGic/telugu_whatsapp_video_status_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxabeb.rf.gd/anticoagulation_in_liver_disease_guidelines.pdfIn PDF document text
    • http://zukisipunomeda.epizy.com/foviropajadikuturunew.pdfIn PDF document text
    • http://meluromotav.rf.gd/55866890823.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/78016608278.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_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5008 bytes
SHA-256: b727e7bdae3711e40a362f69155f89b9ddd50b78019e2bb00196386672598fd6
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 10668 bytes
SHA-256: 745197562bbf7cfbd4a5c5561bbe20550d70abf502c648d2142a03089820f9e0

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