Malicious PDF — malware analysis report

Static analysis result for SHA-256 982b467aa12bb19b…

MALICIOUS

PDF

68.3 KB Created: 2021-02-28 16:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b3c6e88b27bf08a6d85c4ec6be9b91ff SHA-1: 57ea5286edb51a0e5337db3d01a0311a6f438aa2 SHA-256: 982b467aa12bb19baadd00afcd54f353aba0eed33140ae4d9f9419f4cef0d6ce
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to trick users into navigating to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=cosco+high+back+booster+car+seat+instruction+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485012/normal_600b59a113b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_6030a9c9c8fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fda6d34ed552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_600ed64db6774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5fdd36631053d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_602a0ec31ac06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_6027d6abbeec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_5fe91da56825d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6018e926d1b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fcbd02b4538f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_5ff3a0ba184b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5ff51c1101e76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wisituvoj.epizy.com/cannibal_diner_english_movie_free.pdfIn PDF document text
    • http://simoronoki.rf.gd/hp_elitebook_8570w_gaming_performance.pdfIn PDF document text
    • http://sexikiti.epizy.com/technical_report_table_of_contents.pdfIn PDF document text
    • http://dodakot.rf.gd/whirlpool_quiet_partner_3_filter.pdfIn PDF document text
    • http://mewokusexet.epizy.com/tubekisamufilikarukagawu.pdfIn PDF document text
    • http://gosujol.epizy.com/jlab_wireless_gaming_headset_review.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_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 5320 bytes
SHA-256: b0598fe8a457abd0804e577e9561c9bd0df33b413e90e515b55788655bef546b
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10116 bytes
SHA-256: 37f9d75b66667a9a813b22231244d47f89994051d6402ad3ec85a46c49ad1484

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