Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43f3745cd010a60…

MALICIOUS

PDF

71.9 KB Created: 2021-03-03 22:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 757dd07afaf0ad339aaa5b500d7cbe1e SHA-1: 5dd2ad9f4e8c89c562eb7072ae07067ab9749c08 SHA-256: d43f3745cd010a609ba7e9706b772489319be375f1b0c5ed28be8d14d6e86bf3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrustworthy sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=is+a+thousand+splendid+suns+a+good+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5fcebd221e5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_600c7bb17c6c4.pdfIn PDF document text
    • http://good-production9.site/munezuzalitepoki90j2.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/zelup.pdfIn PDF document text
    • https://cdn.sqhk.co/pujigaloruri/fifvTWM/fugul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6023734b386ee.pdfIn PDF document text
    • http://kind-insta.site/ziferuraboxagowaladomicy7hd.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/2bee1d8512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fd2aee05ffe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_6009a8732b88e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/gewoda.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/antlr_grammar_cheat_sheet.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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5264 bytes
SHA-256: f24387861ea1bfd68d9b679002dbe3a9a88b2cf73c7f6a5d96cd0ba5a314d480
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 11052 bytes
SHA-256: 33e55ea461b2d977eaec182e98850df0bedd1486946b342ab875ff111861cff5

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