Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b24d021832020f…

MALICIOUS

PDF

59.5 KB Created: 2020-12-21 05:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7192306dbff45dcd0ef9ffa57a227bb4 SHA-1: 5cb4f7a77ed421f10e5bce380c29bad75865c885 SHA-256: 42b24d021832020f38bdbf1d6759549dddd08e0e9e2b820eb25d64a0bab93644
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a malicious redirector and a PDF link farm. The primary malicious URLs identified are traffmen.ru and sinuxogutit.weebly.com, which are likely used to direct users to further malicious content or phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=biointeractive+virus+explorer+answers
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/eb621a95f63f5a4.pdf
    • https://rogewakaz.weebly.com/uploads/1/3/2/8/132815912/zazarirekelazura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kifutizijebuj/python_3_string_concatenation_performance.pdf
    • https://static1.squarespace.com/static/5fc552cfab79f442f246e6cc/t/5fcf9436556296156157bb6d/1607439424889/war_strategy_games_iphone.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/87327924752.pdf
    • https://s3.amazonaws.com/zamuriza/allah_k_name_video_free.pdf
    • https://s3.amazonaws.com/winumigutam/pilates_iq_reformer_reviews.pdf
    • https://s3.amazonaws.com/wulotugadag/89665422917.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0d078bc8713fe6fff359/1606225160280/dedirarudewokupefipimil.pdf
    • https://static1.squarespace.com/static/5fce545f93cc064e70e128ec/t/5fcfdbddad97cf6d872e6c6c/1607457759695/fowidaj.pdf
    • https://static1.squarespace.com/static/5fc7817281da8a590db0efa2/t/5fd744d9df2f0204c252597a/1607943386018/radokelororibuwosise.pdf
    • https://s3.amazonaws.com/zafaronivaj/86008475778.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe2.bin
1bb9f176cc128ddd61f98c075e1b8a9cca1b7c2e3fa830a39152e61fbf002050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 5196 bytes
font_01_sfnt_off0000c1b5.bin
713d718015972b17487f7b60eccb7d407a9ca137d218f495680abba45065f414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B5 9292 bytes

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