Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd763f2247fc42fe…

MALICIOUS

PDF

86.6 KB Created: 2021-04-23 01:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9755753890c31657c9fef6cc676d150f SHA-1: b144261fcdf3d18653e25d4c44d7246c81fd4565 SHA-256: bd763f2247fc42fe475c33c7ef86c5ff5b2ca421700be572c61acfa0a681d472
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=power+cooker+plus+manual+en+espa%25C3%25B1ol PDF link annotation
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/826734.pdfIn PDF document text
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/4949190.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jcijOgo/mn_tree_experts.pdfIn PDF document text
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/sazegose.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/iiu8T1j/2934714557.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/tefowiju.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/avjjfNq/antares_auto_tune_app.pdfIn PDF document text
    • https://mujonuwamuvix.weebly.com/uploads/1/3/1/3/131383921/8296295.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_79120f33afed4cc6ab138b169d73c876.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c402ab-e475-4c83-b1b0-aa32ddc355af/what_is_non_woven_interfacing_material.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_ca47977d78ed4fb28a4bcd3473468a8f.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_f7f95f52a7de460a8300a79a48413e11.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_569fbf8ef5b747afb71361d68eae65c2.pdf?index=trueIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_bc70b52a3dcb47e4914dbd9d0c87bf61.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_729d25c55fb54c6e9441fd1ce029ea35.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_0b7b5a7c3b5b44d5b37a2b3abc2e14b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/degavevefo.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/enterprise_data_warehousing_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98993d7f-5eb6-42bc-bda2-13c6c0ce3297/putiverivadufaxudemavow.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_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 5448 bytes
SHA-256: ccc06b19cfddf898635b33d153eecc25371d0e77de37409d88ed2851827fc59b
font_01_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 12200 bytes
SHA-256: 0157234b7830b52ecdd200da35a4a26c2555634a7fc421a5bf76a5bc83566f87