Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0ff2ea3f68a11…

MALICIOUS

PDF

79.4 KB Created: 2021-06-12 22:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2951704e353d65291d0b4483e80e3409 SHA-1: 1a36a8fe4e047819e1e621deca499300af124254 SHA-256: baa0ff2ea3f68a11c37337ef3a9fea6ab7f3a6795444fc2d4059173fc71e4155
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document contains numerous embedded URLs, including one pointing to ketchas.ru, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's intended to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=rent+agreement+format+in+english PDF link annotation
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/jebesulosa.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/vuvamawusefarivise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_60029b8c3aeb7.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/sarazemumuvoguri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_601b1deca4b76.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/pezibuz_dulun_vovibuvar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fcaa3d0cac76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/145008393/51566873311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be07a544-0b7a-4105-bfdd-8b25b4b59f0b/risewekera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a124b94c-c052-425a-bb08-3718f822d4df/why_does_my_kenmore_front_load_washer_leak_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac88c00-2512-4fe7-9c2f-7ce578f5938f/8537044161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2ef845-eaa2-47d9-a634-69c7b2aa3a4d/the_complete_green_letters_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010057f4-f4a7-43a3-a41a-c7dcf75f9dde/ribogug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d98bc9-1713-42aa-b86a-10ea384f7303/paterukewipowoludetag.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423594/65741816773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b5cc8d-780d-4faa-87b6-7539bf695cdc/how_to_change_gopro_remote_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6bea0d-79ac-44c0-8728-121d965dfa97/sony_dream_machine_alarm_clock_icf-c318_manual.pdfIn PDF document text
    • http://gorixose.pbworks.com/f/98029180940.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144422865/60025668458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5915da65-36b3-46a2-99ba-d7a82d13025f/zaraloxovuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b1a105-017e-4e81-b3b7-160483d3e811/leather_cabin_bag_with_wheels.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144883905/neet_biology_chapter_wise_questions_and_answers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804ab083-6e65-4c4f-bbfc-d6f347e9b99b/sex_education_season_2_episode_recap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 4976 bytes
SHA-256: 14832336ecd5f6d98c5fc698711f4c48d11153dda53e14a591d679fe4cd86c51
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10880 bytes
SHA-256: af7d348a8d9e4ded73fec3bd0e0df31e8585b4fdeadeca988af1e06d7d889110
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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