Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3823fd3f3241e17…

MALICIOUS

PDF

72.9 KB Created: 2020-12-20 17:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb200137a3b5c24f416b3a688f609e08 SHA-1: ec6e46d69124ed2ed0109b037627f616c6b943c0 SHA-256: c3823fd3f3241e1789b3b81ef63d35165061f8311d477e3ef3ea02d317b3598c
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 embedded URLs pointing to suspicious domains, specifically 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious purpose, as it indicates the PDF is used to host multiple links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=5e+monster+manual+errata PDF link annotation
    • https://mutabitobivu.weebly.com/uploads/1/3/4/6/134636436/ab7a1a9447359.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/c9067531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5fbe1f2310ab5.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/5548770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5fccb7526abee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_5fb25f68583c0.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/fosagoba/96298067936.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/bncc_na_educao_infantil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53130633-44d6-44c7-b1c3-3a6daad987d8/pointers_on_c_kenneth_reek_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/road_map_of_bangalore_city_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29d8640f1034a5cb3e639/t/5fc51af0eaf37e3b643f2477/1606753016745/mandrake_the_magician_girlfriend.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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 4860 bytes
SHA-256: c7d0ccbe70f7ac290b5c3abb83af7998afd9b6c80748ab7611cf9d72984b5ee4
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 11184 bytes
SHA-256: 9039c54754c679225bb44917d0fcd38f7352b8d1cef55327ee037f576b56e8bf

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