Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c09e801baa024d7…

MALICIOUS

PDF

68.3 KB Created: 2020-11-26 08:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b01d0ce3038c059c8e336fbdb7700ed9 SHA-1: 063acada41f61db7144f40a31e57a2ba5fe9e9a3 SHA-256: 4c09e801baa024d7909ab3406deb4253b28e94d8a8c9dd021fa732dba0dd3e98
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one pointing to 'trafffe.ru', suggesting it is designed to redirect users to a malicious site. The document body, though heavily obfuscated, contains text related to 'Mahopac middle school teachers', likely a lure to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=mahopac+middle+school+teachers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fbf3692b0366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_5fab033e9a9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5fb8bd41ef101.pdfIn PDF document text
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/5458240.pdfIn PDF document text
    • https://refaxezadale.weebly.com/uploads/1/3/4/3/134325555/2969927.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/numekutetolawepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8a4093800f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fa0942fb0a0c.pdfIn PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/nixafaresetefuvo.pdfIn PDF document text
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/2014726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421614/normal_5f9b190b17a6f.pdfIn PDF document text
    • https://fivugolukebil.weebly.com/uploads/1/3/4/9/134902908/3126900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0f9035-5647-4bd8-a4fe-0d679908c2f0/13588904593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7a6c2-de72-4e9a-a7bd-f3e5c6ca347e/jatotugubal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf8bbf1-985d-43d4-8430-cf5593e3468c/canon_print_inkjet_selphy.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_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 5316 bytes
SHA-256: ad8c3621eb837ca12758e13879fdbb026b59d2395cbf18e2b7595c692e388520
font_01_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10384 bytes
SHA-256: f048f938bca77337b0432033a9517fc2d1a26cee7bc8edc4aec9103ce1dacb2d

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