Malicious PDF — malware analysis report

Static analysis result for SHA-256 1698dce8772e2285…

MALICIOUS

PDF

89.8 KB Created: 2020-11-10 12:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a4893a80a7f516c05d87f708ac3a9eae SHA-1: 16ccf1724df90277d83224437c4d102131446f9b SHA-256: 1698dce8772e22852d859ec3512441e7bd8c3025995e8fce6c3b41e27f17a504
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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?keyword=mammoth+hunters+pdf In PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/mavoniguxizub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f87b6e11a917.pdfIn PDF document text
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/voposukikag.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/2959267.pdfIn PDF document text
    • https://vofutomafete.weebly.com/uploads/1/3/4/4/134463257/b5261b6d8d4198.pdfIn PDF document text
    • https://wodelegijulafa.weebly.com/uploads/1/3/4/6/134677223/megukala-ganubate.pdfIn PDF document text
    • https://savijuwopezego.weebly.com/uploads/1/3/4/4/134464024/wodegopomaf.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/ad36dfde.pdfIn PDF document text
    • https://rizowexerezo.weebly.com/uploads/1/3/4/2/134265486/4344241.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/nitajosasa/10929712471.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/79307585332.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/yellow_belt_six_sigma.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/final_fantasy_tactics_advance_2.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/hitman_2_ps3_trophy_guide.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_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 5256 bytes
SHA-256: d47f3705dd913d6ed4ff25ddf90cd5a22150e0fa17baa0da4c11d579c7359c04
font_01_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 12024 bytes
SHA-256: fb230bf3eff38d1f81992b82e2006385e39a69ecdc8a368bca694bb801907ba3

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