Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb50aea571b3377…

MALICIOUS

PDF

87.3 KB Created: 2021-03-17 02:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aadbba7ca862d52f5a320b30a9b5d539 SHA-1: ca27ce2f57696f507e2a36279f676bcac969ab71 SHA-256: 9eb50aea571b33774675cdd8d49de95ef0f71e3b8eb22cb8a76ee8fad6a75573
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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://dafemum.ru/123?utm_term=auto+start+stop+manual+transmission PDF link annotation
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/9165248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474191/normal_6007375cef754.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/8989425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_60228ad253f29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fcbee51f3110.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/tuwusigopuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_600cf6ff77da2.pdfIn PDF document text
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/luxuzaxuzukusedupis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_600ceddeb4346.pdfIn PDF document text
    • https://bevazemirif.weebly.com/uploads/1/3/4/8/134873662/lebebenifonob_nozim_fujagegub_padef.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/4a99c2e210ea.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/1c8b1d738862b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_601cc9e3f3ce9.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/828859a2-9949-4936-a511-fc85fb14efa0/a_spy_in_the_house_of_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e48568-84a8-4e0b-bee8-7aa2912010d3/livros_espiritas_para_download_gratis_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e91d2b3-5e38-4223-ba32-c96bfca9b0a4/timex_indiglo_expedition_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8131f76d-4898-442a-ad78-b47a6d8d5a07/rules_to_simplify_radical_expressions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5522fdaf-08b8-4e86-8dd8-ea456078497c/43801175376.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_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 4956 bytes
SHA-256: 33e0f5c784084787fbbd8a639b35c7dfd8d3844cef76136815799d0cc43ab6eb
font_01_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 11656 bytes
SHA-256: 0bb3cfa6a809cf7c56105ee57fb4365594b3da35457e74d0bd6be1ad2e911c1a

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