Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb20250536d30be…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 07:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61ab851cfc7954b4f31a82c0a9efb6f7 SHA-1: 5942e72e5d3293a13703ffb8a2550c3c311d6cc4 SHA-256: 0bb20250536d30be1348d049b4d3a9db4a08cf8948ee68263896a55f64442a72
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/wix?keyword=vera+wang+bedding+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454691/normal_6033a8521bae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_600c3504c21d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_603c2209861d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fdb76d914155.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/jjyjjnc/child_care_licensing_minimum_standards_arkansas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5fdeb6bbbb2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_5fd8faa145d7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fddc147e8381.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/dhio7id/xcom_enemy_within_long_war_best_starting_country.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_6010209914612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426967/normal_5ff29739f0360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6037b457a49d5.pdfIn PDF document text
    • https://cdn.sqhk.co/sekopanosesu/l5vuHje/transverse_abdominis_exercises_physical_therapy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6039209652ade.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/biejgL7/gulamemeroxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/imjbidn/totez.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/0db8d4bc-9e67-4805-8c80-0b11cf08304a/persepolis_marjane_satrapi_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e0843f-a5d5-4d79-8e79-f71c089bea32/61681903265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a199a46-2fc5-45bc-a52d-d7ae9473ce15/how_to_study_linux_administration.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_1038ec6fbb1f42e3a4f91587e688e269.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_67251aacf1f749c6bf8f189ce88e15dd.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_c7fa640bdced45e4bc2f93a5b4710abf.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_7ba0c15dea074c7e9a67da7bf3a2b253.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/774a191f-47ba-453e-9a68-b9b9a81b44c3/47557538826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b7f309-1fe1-4de7-9798-8d3c5ff2233a/sony_str_1050.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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5252 bytes
SHA-256: 5c7efb1758aebed96a4d152e2b901bc14d7394c28ca62f812283f6f45e4f04e2
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 10320 bytes
SHA-256: cb866ecaf11e01e15b82b185049b3ba9127458a69b8bfe8a4ff58cd5547ad84e