Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0bf0a92a301787…

MALICIOUS

PDF

83.8 KB Created: 2021-02-22 04:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b1ba9bf52d7bd77cebbc97dc32a86baf SHA-1: f88865b3e2823f4523fae14c475d5ebf18ca85a8 SHA-256: da0bf0a92a30178728c57a1b69f50a8eabbb2c617d8efd46b0de1db37b4c87f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=the+purple+cow+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379960/normal_602824a672191.pdfIn PDF document text
    • http://zeraseb.66ghz.com/small_business_meaning_and_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_6012950648664.pdfIn PDF document text
    • http://momentshop.website/keponigunitenf2e3h.pdfIn PDF document text
    • http://slmit.fun/cucet_previous_year_question_papers3fbt.pdfIn PDF document text
    • http://kvrovk.xyz/3300071137r56bb.pdfIn PDF document text
    • http://accface.in/sharp_objects_ending_bookr2uuf.pdfIn PDF document text
    • http://skameyki.club/53974597993sat0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5fd053918c848.pdfIn PDF document text
    • http://konanozopesan.22web.org/futosobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5ff2ddb16ab4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_60100001eb8ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366045/normal_5fff0f7a4d5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_5fdb56451e186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelotisevinok.rf.gd/68165076669.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 7736 bytes
SHA-256: 80322b2894a91b2bfb44d97dd68ef6fd4943a500c1450e96215c91c489e367e2
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 5100 bytes
SHA-256: c8e2054ee54d57bdd305527fa3876ea6633b229e35e516cebf216021aca6c408
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10624 bytes
SHA-256: 1dc73b845861676c86a87a50c9b3e4e2165f233b75f8543c4765d339fe586095

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