Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a6e0dc2a4d7f0b…

MALICIOUS

PDF

72.7 KB Created: 2021-02-13 16:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 05541794ee0e3e9e3e3e228298c588f3 SHA-1: 6b5d28ee7a6e2c2155b88a2cd241a23a3014bbaa SHA-256: 09a6e0dc2a4d7f0b1df38642b9b5a55b1682d97422a3c72a017568001c94cb37
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'man of the house claire date guide' which likely serves as a lure.

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://jottigo.ru/123?utm_term=man+of+the+house+claire+date+guide PDF link annotation
    • http://icily.xyz/bollywood_new_movie_video_song_2019j5t4p.pdfIn PDF document text
    • http://rating-bookmaker.ru/mergers_and_acquisitions_for_dummiespb1s0.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/bezurupez.pdfIn PDF document text
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/1143527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fee3beb8e62e.pdfIn PDF document text
    • https://rebomavarel.weebly.com/uploads/1/3/4/8/134883959/lumekudoji_sezerinozi.pdfIn PDF document text
    • http://thrivewebs.com/vidmate_ing_movie_walan7a12.pdfIn PDF document text
    • https://vusuzawemuli.weebly.com/uploads/1/3/0/7/130775102/buleki.pdfIn PDF document text
    • http://org-fruit.space/birinofukiduzarivavsv6sg.pdfIn PDF document text
    • http://show-visitor.xyz/viredopaxagasudigidvya8w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polexusuzoxofiw.epizy.com/wivivora.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/linopozozirisudarevo.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 5288 bytes
SHA-256: ad1f8aba1286697ee98327285da9effadc50d7cff0d2eeedc2373bca8efbdf8b
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 11428 bytes
SHA-256: edef3b5432725f50ac1a84d955d11da13088a80e8861b3989bbf7c0620ad190e

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