Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d8f1b3617dd708…

MALICIOUS

PDF

75.5 KB Created: 2021-04-19 02:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 82a13e37db00ccb050019e44bea51bf9 SHA-1: 06196e8c0f23685d7e01144f38c57891f8b9592d SHA-256: 05d8f1b3617dd70883e0ae20f9fd53a814f371c2dd0b9ab43816b03d7cc797f1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is dugedepap.ru, which is likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=is+the+samsung+galaxy+a10e+good+for+gaming PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501374/normal_6004e374510e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_60329014276ba.pdfIn PDF document text
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/wagimaxoroxeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_601384d8343ed.pdfIn PDF document text
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/650169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_60202d393ad2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_6043987b8fe97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_6012a25bc4333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_602d5090eae98.pdfIn PDF document text
    • https://pimabebobi.weebly.com/uploads/1/3/2/3/132303226/856442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_606788cceff36.pdfIn PDF document text
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/vitegukobidipodowafi.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/dbd22b20-948e-4f2e-a460-88c19e99c5e7/2660455451.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/what_interest_rate_is_usury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26acf495-66bd-44a4-ac17-51059ff2a34c/how_to_apply_for_medical_leave_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693dd497-3a88-469b-91be-cd274802fca9/what_is_the_difference_between_primary_and_secondary_standard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6ff56e-74cd-466e-b15d-8749e6db725d/are_insignia_tvs_good_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da32adb-5f8b-45b4-852c-75ea3d55dc87/silifokibev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36ec562-3d6f-4e8b-8a07-e4bd94907c43/how_to_unlock_a_lg_k20_cell_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4297b7b-5185-4208-ac55-71c7bb943172/95657241906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f7ccef-a1a5-40a6-a54d-3d8c0b218ee5/petitifufawup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294a22ac-5298-4d9b-9d66-6d5303514d4c/33048162553.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/can_just_one_person_buy_a_house.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5620 bytes
SHA-256: a9cf08464e0058a7df88d90754694cc5863eeacb9dd2e665586c0b6591ae59d3
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 10460 bytes
SHA-256: 2486e392f19c0050b5f2b5738c1e73a170b4f6b0b779b213512a3eeaff75a8d0