Malicious PDF — malware analysis report

Static analysis result for SHA-256 04716cd6b98e38b4…

MALICIOUS

PDF

70.1 KB Created: 2021-03-18 12:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6615590ed47b74447b5db52486322076 SHA-1: 22adb5f6e6b27c334a1cfe9a7f183f1ae74d5c8e SHA-256: 04716cd6b98e38b440426d79052d4b33a3f83002226bca016204120525a4d91e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, some of which are hosted on disposable domains, suggesting a tactic for SEO manipulation or to distribute phishing content. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

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://leonvi.ru/award?keyword=stamford+alternator+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/rarukaboz/jcjaLU8/juwomevat.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/aXibbwz/20385031507.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/Zifib39/potiru.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/32ihgua/funny_words_that_begin_with_the_letter_a.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/eLhggj4/20144215402.pdfIn PDF document text
    • https://wuwinotidewav.weebly.com/uploads/1/3/5/3/135349353/divivuni_wokorafazimokof_fawuzubadagepu.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/0qliMat/idc_worldwide_smartphone_shipments_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/cIyMfvd/nalameragojo.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/gdig55R/marketing_jobs_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/jchh5kT/jujaxapibijusutovujalofad.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/6814622.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/gebSicj/molisiwopasumijos.pdfIn PDF document text
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/lotivanizuwudi.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/jovomut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_a9f129b81a76402796e02b76c654c409.pdf?index=trueIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_fc6f7174da654dca87fc06f27a060cba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdb1efe-d325-42ef-b302-ac1995660d34/65004037069.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_f1b590dec9d44f9bb8687c0d5519257c.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_613e36dc896247879d4f6e855e20a862.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e8d79e-017e-40cb-a766-cc23dd498ab3/walgreen_digital_thermometer_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff87aa4e-7635-45f1-8b4f-56f609520031/nikon_af-s_dx_nikkor_35mm_f_1.8g_lens_price.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_d9a3b4141c3e45d7bb33d001ee507fd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1010debc-c40e-441b-b3f7-8d489c587d1b/tonezukineravapurafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801416d9-2d53-4427-8461-cdcd5e980bf3/apc_smart_ups_750_battery_replacement_procedure.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 5112 bytes
SHA-256: 2bbcf040b31de0ad218ccf0ece3eba3a0acf36656c42acd0e40a1f26e9cb6a92
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10212 bytes
SHA-256: c771a5a05be8a714b0eb4a4975e020d6975214e2c0af28adb5d8e46b69c02625

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