Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e062453ffe14ac9…

MALICIOUS

PDF

73.7 KB Created: 2021-06-07 18:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a9ea503c2408ffc470428ab9d105da1e SHA-1: a7f32be00004711576890e65d98373d00a445d02 SHA-256: 7e062453ffe14ac9f1bc220793c010378c40668d4f83ab2a4776522fd3a0f5f1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with a primary URL pointing to 'medvor.ru'. This structure is indicative of a phishing or malware distribution attempt, likely using the embedded links to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=what+is+jevity+1.2+used+for PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ff043d0e9067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5fc6daf3b8e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_6063115a600ff.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/2866199.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/fifofurimo.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/fb89f47f2.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/03e11caf-6c3a-43f9-97da-252e65e98c9d/61823053431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca89a9f8-64e4-44e4-8a52-1c322d479fed/16670924447.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/f/ejercicios_de_acentos_en_espaol.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/autotrader_classic_vw_beetle.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144523326/how_to_measure_size_of_bullet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc94d640-12a6-476c-a7c5-176beac52920/tolutalaxitinalo.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/f/36916354275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac352ca3-0106-494b-b564-bd110b5e45a8/jakonowojiveg.pdfIn PDF document text
    • http://kalejesezuda.pbworks.com/w/file/fetch/144657819/how_do_i_reset_my_bosch_silence_plus_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0783fa94-6b5c-4c08-bf43-1695b00cac04/schumacher_battery_charger_se-82-6_manual.pdfIn PDF document text
    • http://pajuxuse.pbworks.com/f/xaduxexidoxoranilasobox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4436ad-c5f9-41cb-9205-8405c2932798/lokofevo.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/31149319356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071cbe61-ed22-4819-b8ae-19fa35e536c5/how_do_you_tie_a_jump_rope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f258a9-1017-4863-86a3-b9b319812fec/84263655734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bae3e1-e5e0-40f4-a0cd-e5c1241814a0/the_second_sex_book_summary.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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 5432 bytes
SHA-256: b8544cbcf4d07e2432be8733929e174ed09e5a6eca9d8af83f4c4fb03a210161
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 11136 bytes
SHA-256: eb8887a9b43b2bebee547e45b7d6f612c58cc4d0fa6ef5d393f4a01b47455357