Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac6230ac78424d3…

MALICIOUS

PDF

91.1 KB Created: 2021-03-30 10:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 781a7a9f8c48bbac0aee0b8ed02a958c SHA-1: 57c5b39022f1eb67287edfb9a60e24babc12e708 SHA-256: 6ac6230ac78424d395027bf0b12662e663082c9db2c3455a0903607345a6e30c
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('dugedepap.ru') that is flagged as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to distribute content or redirect users. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic suggest the document is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://dugedepap.ru/strik?utm_term=theories+of+motivation+psychology+worksheet PDF link annotation
    • http://sberin.xyz/texas_roadhouse_nutrition_facts_weig39vft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_603821177f73e.pdfIn PDF document text
    • http://twenty-promo2020.ru/la_casa_de_bernarda_alba_characters_analysis2dxvf.pdfIn PDF document text
    • http://instapriz24.online/jodunena83k3t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_6023d623244b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5ff002919d1a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_603b169c3b75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_602ee12d195d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_60419afc42630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fef8edb950a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391303/normal_5ff0ce149e5d9.pdfIn PDF document text
    • http://shoop-ff.ru/bofokusiignxl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fdf69d1ce82c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/36916134848.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/sopufemupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47675541-027f-4da4-9d09-d71358d60c05/64788952403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcb6fb0-9565-4710-b9ae-17ed0b46816b/8655445049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3000ce62-ec32-4c14-95b6-98d4f0570a38/bosiveluwowufuwegewesofel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db44dc40-5bd6-464c-8e92-18ace7a5635b/the_old_republic_online_shops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07bfa83-758d-4aac-931c-61a2c19c083b/9169132008.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/pojumomatob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9067b171-b184-448f-bd5b-cb04ac710f71/fearless_album_artwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3731a32-671e-4d63-a8b0-d5a77dc7a740/exerpeutic_900xl_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/policybazaar_car_insurance_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e144284-66a6-440a-82b1-a68503487393/babusijuzurokesosusewig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae9886d-8875-42c3-bb1d-8597c9db8c25/logitech_z506_5.1_surround_sound_speakers_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/86686790911.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 5696 bytes
SHA-256: c3f811f6c71cbfed41c9353c9f1b15b5604f0b5d0626fc7f4a6e223a8a84e3bc
font_02_sfnt_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 11244 bytes
SHA-256: c51fc921bcd00337b866570d5e0ed7e06dad5b20e7371295b0037c07a7caccdb

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