Malicious PDF — malware analysis report

Static analysis result for SHA-256 7342fb9256c02639…

MALICIOUS

PDF

73.0 KB Created: 2021-06-01 00:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 94de4b93a58f5bf64ea472986e315b29 SHA-1: 54286082d933244aaff65c88e26ff0f509098d98 SHA-256: 7342fb9256c02639b0ed28c3d4245c31dcf96c9fa0ae1b8e23e0fb5b79eb336e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

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://coretry.ru/pbw?utm_term=canl%25C4%25B1+ma%25C3%25A7+izleme+program%25C4%25B1+indir+pc PDF link annotation
    • https://silosapa.weebly.com/uploads/1/3/4/5/134580216/nujozafuborebek.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/7641344.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/7982686.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/cd8e6.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/8471830.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/zevufi-xiwukod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_6031437c99f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_602c662e048d2.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/3588f4.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/timal_vubune.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/f69fafe4-89d0-4433-b383-675fc14f2051/zafedugajup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e153a4-2444-47fc-8a8b-6b0b5f6671a3/how_to_farm_weapon_scrolls_archero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76bd279-de49-47ac-9700-f90a2c54b2a2/popeye_animated_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9429242a-b12e-4462-bf38-4e5649bbf9c6/vesib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b64ed4-5565-4707-9af1-13a5c40823e6/diwenuj.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/izgi_film_indirme_program.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/malm_under_bed_drawers_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c6aabd-84c0-43eb-855a-3cc5377d4d7c/basic_5_pre_employment_medical_exam_hi-precision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a516b30-3237-433e-896e-b81d0eb6be11/how_many_calories_in_chick_fil_a_fries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1d11ee-4f9d-4f68-bc21-2fd26bed7420/jowoxivoxekagikogaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a144a8d2-d1fd-407c-b33b-f047f455fb96/how_to_start_family_court_proceedings.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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 5384 bytes
SHA-256: 734261872a86bf733a0afdc1caf0250404bfccf2eba00b40b773c150f30914ea
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 11988 bytes
SHA-256: 80ebd153c6d5fb0dd1999ff7b63e6789b35a5899705ac3554d79c252b52a5164