Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e9a96d8ad6e12e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 16:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 60db689c78f0d51efb37eefb2196da08 SHA-1: eeeaeec6285f3b6361f4a596822a38b7c452baa0 SHA-256: d3e9a96d8ad6e12e5e0e8e822b5e607b64fd13f0dbc6437448f91d47284dc058
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jottigo.ru/award?keyword=advanced+excel+formulas+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5ff288f186e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_6041d6bad9cc6.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/master_algorithmic_programming_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_603fa0bbdef1a.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/pimejowokale.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/gitubup_jonare_kuvigusor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_5fe7076b965fe.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/nikon_dx_lenses_55-200mm.pdfIn PDF document text
    • http://pupunorip.getenjoyment.net/69591012718.pdfIn PDF document text
    • https://timemojorejo.weebly.com/uploads/1/3/1/4/131437846/fa81fb117cb21b.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/276e05a6.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/tewejisudumajenokadatorir.pdfIn PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/6244976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_8323d805d45b445fb9cd289bc1887f42.pdf?index=trueIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_60dfd69fcc7b444aac194e2b8c99e8c7.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_e5aa8b4c4ea64e2ab6efa2bf22a96db3.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_7e62c4363d114f23b0c3154ce00931f7.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_afa8e92032bb4cd7ab56270fb07763dc.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_4ff44b8510c84afaa54d31cbf751cfc8.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_6f17d53d46be4689a144264be9a46e94.pdf?index=trueIn 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 5512 bytes
SHA-256: bdf4438238d6334459bed474bd4823d4991addf63b13970fc15811d4ed030065
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 11148 bytes
SHA-256: 94d177004e39b9081580abc9b0478f1963441082f4a6d4b0c277aaaa19130b76