Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e850b90c2b5672c…

MALICIOUS

PDF

72.1 KB Created: 2021-03-24 08:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02fcdd2e63d7582489b2690680324d8a SHA-1: 5e266a7a534104fd9daa297eaf1ae48874183a8d SHA-256: 2e850b90c2b5672ce14430220d6da88b4b8084147e5852f739fea939d3b29432
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=subaru+wrx+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407552/normal_60483400351eb.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/mebozo-sunilogunakot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_605908c5c68cd.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/3035255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_60239d2bf224c.pdfIn PDF document text
    • https://cdn.sqhk.co/jalivotenos/Fib3qij/sky_sports_tv_guide_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5ff329a6973b4.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/haJggJD/ps_108_yoga_schedule.pdfIn PDF document text
    • https://kupejuzog.weebly.com/uploads/1/3/1/6/131637034/7794805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5ff91e6864bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600f5476b559f.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/ijdjahe/prison_break_cast_season_4_episode_16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_60246ffa468c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd6a116e2e8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fc66493152cf.pdfIn PDF document text
    • https://kukuwusak.weebly.com/uploads/1/3/1/3/131379738/jejexumal.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/bdde4601-fed6-4be8-bb92-9fcafe36c488/21733824179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d216c7df-7abe-48d8-99b0-6c0aa3a675ab/pop_up_book_mechanisms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9dc163d-ba1a-488f-a96e-7fe8cba89932/best_logo_design_software_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8706c8f-18e7-4e0b-b2f8-f391af6299e7/75924630536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b498d146-45ec-4762-bf46-1d95e96bab45/how_to_clean_dirt_devil_vacuum_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f0cc99-7ce0-4cca-8f76-61a6d6b034e3/what_is_the_zip4_code_for_my_address.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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 5408 bytes
SHA-256: cdbdfbf118aa24ffe14b071dcdae99812fc8e4fbf90d4b43048ea0d76b057e55
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10516 bytes
SHA-256: 35591b519ca7a709abfe98b5bd9e0b5105b8505c017071fbbb8fcfe2942703c6