Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6eb61da30db741…

MALICIOUS

PDF

78.1 KB Created: 2021-04-05 04:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e12acaec92b607bff5bcc8cd845e4614 SHA-1: 2a8d10304e7fcf5f9e28fae49f6db8a15073c035 SHA-256: 8a6eb61da30db741a4e0d0c9ec0b03be7d0f27a53af14e33509e9d1e1a9ca38e
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-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://golowaki.ru/strik?utm_term=metal+gear+solid+3+subsistence+disc+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489846/normal_5fdb2542ef265.pdfIn PDF document text
    • https://cdn.sqhk.co/pododefakes/Whchlhj/79134822991.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/K1Egfjd/radio_flyer_wagon_plastic_with_canopy.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/igY4hd2/zubatepu.pdfIn PDF document text
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/08fa4c41726cc.pdfIn PDF document text
    • https://zawurufaxi.weebly.com/uploads/1/3/4/8/134861846/8096368.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/5b66cbd4f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/jcak1gh/73897077595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_6062155d34c57.pdfIn PDF document text
    • https://nutotawi.weebly.com/uploads/1/3/0/8/130813366/denivew_gazenaxodafi_susifad.pdfIn PDF document text
    • https://cdn.sqhk.co/numobelez/fjfyBaz/hard_harry_potter_trivia_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/4thiVjc/tabadewudirupisefulujaro.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/bePMOic/vokumig.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/cTheghv/file_manager_download_apps_jio_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a678783-25bf-4270-9795-374ab2e65715/zoxagobofefixodejonipibaz.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_d8500227ad8347ee83a3ac9bfd605985.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/919e5dd8-92d6-4456-9c85-1a99b5df98a9/55371268904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efda493e-2f86-4cac-93b9-ebf50252eb28/39963624015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077a8995-ffc7-4a11-91f5-027ddb8b202c/the_way_we_live_now_podcast.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_b747ffb7d2d1454391c4ed4e91704031.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_eb78877cf4b94830bd7df3cb739b7484.pdf?index=trueIn 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_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 5548 bytes
SHA-256: 2085c6e4d28bd4624a648ff8377d85a85e30d0dfbb2e8ed78763b2394995a818
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 11576 bytes
SHA-256: 195fcda4d83425b0d662c666a8888f29a047d4de147ab86faaae2871549ab4a7