Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cefdb8da36f08a8…

MALICIOUS

PDF

77.5 KB Created: 2021-01-14 18:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb69c92a545f2d243c3add2416d6c770 SHA-1: 25017155a24fe1e505901b95b4d62aab5d892b4e SHA-256: 2cefdb8da36f08a889c639972591de3f56ec71097271f755c9fa770c38eb44f6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure, suggesting a link farm for SEO manipulation or to distribute further malware. The presence of a link to 'traffmen.ru' with a 'cosplay ideas' UTM term indicates a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=cosplay+ideas+for+guys+with+long+hair In PDF document text
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/dezedaxowagu-vazudubi-mewedigixoz.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/9632534.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/c2miige/mastercraft_courser_cxt_255_85r16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5fc57920550f6.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/rakiramaleru_pinagavuju_gifimat_ziliwafe.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/dhfeZeU/58803008031.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/kuloleratisuziduwu.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/8c20fe4a16.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/ghhf4jh/59031645056.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/podewafi_lamatuvowud_botemuzoxojabof_firamixivosib.pdfIn PDF document text
    • https://nojefawagalubab.weebly.com/uploads/1/3/4/2/134266261/kujawumivixapu-babov-xabazepadivodi-fosip.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/mgitIIj/red_button_meme_sonic.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/zuxadol/95237374223.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/73010563020.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5404 bytes
SHA-256: bcc10098a4c93a5d97e831574e835c9b990e86f2924ae1c6f66beb14181167bc
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10944 bytes
SHA-256: f98867ca64de3d883c333308369c1b3275f01f48396fd57284ca817f95f8570c

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