Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f172fb8eb0df84b…

MALICIOUS

PDF

81.3 KB Created: 2021-04-14 19:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5224ceac348aa0a23686d22f023d1db2 SHA-1: 21121b91e2095b3a0803c76abc33db797f2c0321 SHA-256: 7f172fb8eb0df84b68c35d5d987d74f51f017d31759484ab96cab478457adb15
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=lord+of+the+flies+chapter+2+summary+questions PDF link annotation
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/f6e94.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/3881770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_602ef7d14d417.pdfIn PDF document text
    • http://design-kvartira.info/huskee_lawn_mower_deck_partsnblj2.pdfIn PDF document text
    • http://harkateine.fun/uniden_homepatrol_2_antenna_upgradew4lxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_602d8f1286ecb.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/xavolavuripuz-jibavenujexos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fe005409990e.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/b2d532e06.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/8500541.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/4a20d068-0ade-4d58-823c-0a7bbeaa7781/time_management_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17183eb-0f31-49c0-827c-e188bb4f44e5/76147940317.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_4f976c86cf7a44ba9c6c05bb0b6fb42c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/029341e6-23a2-45f0-9192-8ea99952eebe/how_to_remove_pimples_marks_from_face_in_one_day_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7b4f6d-454c-458e-97c0-c45578757757/catholic_childrens_prayer_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcd3246-f326-4bb9-8a7c-c551d89c2e0d/16076919325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d562658d-ed9a-40ee-b8e5-89555d2920ed/what_is_the_average_salary_of_an_aeronautical_engineer_in_india.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_98592d02de7148d6aa8d955958c7fe61.pdf?index=trueIn 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_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5696 bytes
SHA-256: 7bb4491264a4b87a729bc2f3552caa643b7a98679b7a64b9ab0baf6f6eebce07
font_01_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 10824 bytes
SHA-256: c1d748536f384a8686eb6a7be79427b1f2e57b1393f2f8ffcd28bf976f4eb811