Malicious PDF — malware analysis report

Static analysis result for SHA-256 265538f57239b774…

MALICIOUS

PDF

79.4 KB Created: 2021-04-14 01:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: acda02d7724ff3ae996c229e4fe0e627 SHA-1: d1ad659ea55c5d43630d9ec9340bbe63fed711f9 SHA-256: 265538f57239b774dac8b42aa7442dbceabba0f534695b9df236cb250d1865bf
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites for credential harvesting or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or ad-fraud campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=how+to+sync+vivofit+2+with+android PDF link annotation
    • https://cdn.sqhk.co/reparepoki/hihegim/1997_land_rover_defender_90_for_sale_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/gcKIwBb/us_conflict_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/iaPiagf/rafebup.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/djaiaie/diy_mask_easy_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/gvjd6Tu/aliexpress_promo_code_september_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_6c4a000253634c6496e21ff758cc96ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59818f9f-001c-40bb-86f3-5b3618f74baa/sovup.pdfIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_32b936c910e747599ede5ceadaeba1b3.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_1a904416ead74362a0c7670c3f611026.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa32935-90c5-48d7-b102-98b7f4777aaa/kaxorarulolowujimi.pdfIn PDF document text
    • http://fonawemosel.epizy.com/what_does_f2_mean_on_my_sunbeam_heating_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1b3b66-b0b0-4858-8c5a-7f63cd652816/kixavapatuwimofepe.pdfIn PDF document text
    • http://tebubejusudigu.rf.gd/bank_5_fall_river_locations.pdfIn PDF document text
    • http://xaligapuk.epizy.com/ccna_module_2_chapter_7_answers.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_462715627b4b4b56b3131c26044db04a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/forofadipew.pdfIn PDF document text
    • http://zutadefado.epizy.com/kulonosajof.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_1c3ed88519b14a309d33ae08b2537276.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/563b3de9-dd61-448c-99af-d01a22ef7aeb/fisher_paykel_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800c47e5-a4be-4e2a-908b-1702b1678232/24381388045.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_d1899681cced4c4aa6900341d3e95fb0.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_26e943fd58ac4b35a01a0f3946b88473.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/crib_bedding_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 5424 bytes
SHA-256: 87cdb7d9147f3ed6564d4c6615f124a8dea2fbbc5a5c10cfb003b6b4b6f39730
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 11380 bytes
SHA-256: 9c693c570c9f1499eb8f5bcdd01117f600d3afda3979b6872e199fccffef6d94