Malicious PDF — malware analysis report

Static analysis result for SHA-256 261a24c0c48c11a2…

MALICIOUS

PDF

75.1 KB Created: 2020-12-24 13:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cb42645d1b817c3a82cf637fd8180577 SHA-1: 7316f83fc894292d1934d89ee43febb492e95284 SHA-256: 261a24c0c48c11a29faf3912e10c7e57084afff7fa706b8f18de0f80c7643a67
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains, indicating a link farm or SEO abuse tactic. One of the initial links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

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://traffine.ru/aws?utm_term=engineers+day+quiz+questions+and+answers In PDF document text
    • https://subapusufi.weebly.com/uploads/1/3/4/6/134649014/delarusakutumamaporu.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/lipine.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/6bdf39ea4df1a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5f95c164e7c0d.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/pibetupufenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fda8eb104521.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/16e3bda4be198.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/guvipevewunob-venureba-kegebevore-nozal.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/61c57f8881e76a.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/kokajatep.pdfIn PDF document text
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/89d7fe8a.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/PghnhbH/bkash_quiz_winner.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/9986010.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/gewisetug/86542723124.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/report_card_comments_for_grade_2_english.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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 5288 bytes
SHA-256: 3ed9b1035a74215a1e174eab621b4e3b406912c6cb8be9752aa7aa23ede6e199
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10572 bytes
SHA-256: d44e8d09775d222b841235530461aecbaf5544c921806ce2a2044b04fd0c9935

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