Malicious PDF — malware analysis report

Static analysis result for SHA-256 9236c39fff993529…

MALICIOUS

PDF

93.0 KB Created: 2021-03-30 10:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5a351f84bd798716e6a05a6ac670b384 SHA-1: 6cf634c11e29670350021a6690ffaf63f4c37f58 SHA-256: 9236c39fff9935296012afd840e48b1a2e2889103bd9be895d3b27902bfe0ba4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with one specifically identified as a potential redirector. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vilenefex.ru/123?utm_term=bhangra+dance+punjab+information PDF link annotation
    • https://cdn.sqhk.co/lixipadiwel/liijeJo/mutant_fighting_arena_hacked_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_5fe66e7e24794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_5fe9f721828c9.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/iAhjsih/1tap_receipts_tax_calculator_receipt_scanner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_6040ed934b9f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_6008d302def6f.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/2414760.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/4505996.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/Dhf8dBQ/gacha_life_edits_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/duiengg/cookie_cutter_maker_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/dlMUC40/xoxojaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393179/normal_6006d69fafd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_6020a122f188b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5fef9323b8c17.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/7361129.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/5198adceda5f876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fe9f311aab39.pdfIn PDF document text
    • https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/dazamiwojagile-pupuze-xuxadigamare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_54890ee6a931494f8d63c9eac6ba4c64.pdf?index=trueIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_2ef2944cef9f4991bf1bba0e9172412f.pdf?index=trueIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_981c810527fa424d828ec311d38df03d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/west_bend_bread_maker_41030_recipes.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_eef2080b19e6472ab8babbcf9a53f2f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/fujekufegojovej.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/kitchen_cabinet_organizers_for_cookie_sheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 5624 bytes
SHA-256: 6f80ce1e47fcade8df8cc46bf494e33b5278ce1b1b35ec2210e1b57376bece81
font_01_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 2672 bytes
SHA-256: 49493c3bf1ae5ae685640da1731e264891c76ee64278207f10d4dc0897985c1d
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 13088 bytes
SHA-256: eaaf53e3278e2ffd2f6860c8b5020d1b52b91221a1afeb2bd375aea9cddad70e
font_03_sfnt_off00014e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1E 16732 bytes
SHA-256: 462a2c49fc33ed358a3e0f254bff6f2035f50befae4284ce8aafe459929440f0