Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0fa1301af17eb2…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 23:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34836020013b60aec7c38002e66330ae SHA-1: c5069152a7ac0372c01dca117a2088353ce27204 SHA-256: bf0fa1301af17eb2ffd92ee751215d6087a88990efa2959ed60ff1892ab5deba
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, likely as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://maypoin.ru/strik?utm_term=how+to+change+yahoo+picture+avatar PDF link annotation
    • http://fridgeservice.ru/rasajigr8kv.pdfIn PDF document text
    • http://maripifedama.22web.org/are_fruit_cups_gluten_free.pdfIn PDF document text
    • http://toredakaf.22web.org/18545090156.pdfIn PDF document text
    • http://presalle.xyz/40709024582w91sw.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/aXc1Iie/hit_e_knock_down_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/674Dhfm/your_texas_benefits_renewal_application_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/ghxGtjc/the_game_of_life_app_free_ios.pdfIn PDF document text
    • http://doctorzlo.com/zogaluludovoawapi.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hi5ghhd/bonakibaledenekavu.pdfIn PDF document text
    • https://cdn.sqhk.co/vogigoda/hdiajea/kapejimigajavononef.pdfIn PDF document text
    • http://indital.space/563531380452b1w.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/bfae6de9-39df-4d61-8f63-ff7fe9e8144d/first_alert_carbon_monoxide_detector_says_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a4bc43-00d7-44fc-ae99-4b60beb723fc/95955646485.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_7a9e4d50d5a64cc881822c1e822b32a0.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_54a38f0dbe0f43f49a040c357a22f0c5.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_254fd2711ebd415ba8ec0215c0a12a4f.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_838352a78a784a1fb3866a8e5007da1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a88365-7621-4f6d-88ad-d8027a442ea8/vamuzumek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5306de2c-4086-4c23-a5ec-fe1b2da2e9c8/technivorm_moccamaster_59621_kbg_741_ao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d352eea-b04d-429a-81ce-81ca1549de26/how_much_does_the_average_person_make_selling_monat.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8e2d97a5098b4832bece055655c1a94d.pdf?index=trueIn PDF document text
    • http://lijivuzase.rf.gd/97237384808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75dd0e64-bd7b-4fe7-ba39-6b8af33b9c5a/rejivuronezixeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56354690-ab96-4947-9761-5d6c95bb6112/an_american_childhood_part_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2400f6-2023-45cb-aa51-a376168cfed0/90359606861.pdfIn PDF document text
    • http://wafibajew.epizy.com/netflix_for_android_tv_apk_mirror.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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 5200 bytes
SHA-256: 82be7714c0dc12f34d190b177a2fe3546674fef3190ba9387e28b9979bbc72c1
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 10308 bytes
SHA-256: 11074d9cf9e6f5e878d42cd4d4e181cef9d7ce36ed824c5749571570a7bbcb35