Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b07059a6be7bd8…

MALICIOUS

PDF

67.9 KB Created: 2021-01-21 15:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0d39f7b774d5b448de6e3c87d5d8a159 SHA-1: 6ad6efa7085032d2307830ead83188b34acafc62 SHA-256: 40b07059a6be7bd8200e32124306021237897f3b7edb656e7c93506a2223d28c
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to sheet music. The primary malicious activity observed is the inclusion of a large number of external links, including a redirector to 'traffmen.ru', and a link farm hosted on disposable domains, indicating a likely attempt to distribute further malware or engage in phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://traffmen.ru/aws?utm_term=irish+fiddle+duets+sheet+music In PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/bojufo-kabuxufe-valemopumeruwel.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/jhjdEiM/word_search_crossword_puzzles.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/e212ac26.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/iehfieO/zamavumubobowojoviwodop.pdfIn PDF document text
    • https://site-1231318.mozfiles.com/files/1231318/o_l_result_sheet_2009.pdfIn PDF document text
    • https://dubakaxejevam.weebly.com/uploads/1/3/2/6/132696109/jedafitijewe-wekepuxepawoj-rababesatibal-diwep.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/tAhfahf/bereveniwafutopavolumoser.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/xojamekitorabumilewesonub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5faefa3d13526.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/8igz9tY/aerox_2020_price_philippines_motortrade.pdfIn PDF document text
    • https://site-1203268.mozfiles.com/files/1203268/lanokibutagejolomikato.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/gupawupigawono/83730052405.pdfIn PDF document text
    • http://tozoxuzev.epizy.com/pivutufidosabazafezit.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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 4988 bytes
SHA-256: 02d91d6b05cda1eda70ca99ee8a5f47f0c1e530aded99ca8b6aaf50999f0e414
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 10936 bytes
SHA-256: 8ec386b0ce5b457e688fd4679836ac28ec288cbeec307dda3e0b70a5f61a76e0

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