Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ce39110c3a6ac4…

MALICIOUS

PDF

69.1 KB Created: 2021-03-09 08:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d04530bcc13963248869df86acf12f SHA-1: 981c2f38e10172598068fb07ca487f486fbbad5c SHA-256: d0ce39110c3a6ac45eb3e3631c813fb85637ee940b6c4528b6e9f93527934984
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=paper+tuning+stand
    • https://cdn.sqhk.co/tumupowe/UgdQSjg/ketajelofosukupuviruzafuk.pdf
    • https://cdn-cms.f-static.net/uploads/4401723/normal_60145b5a1c7cb.pdf
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/zokumesoj.pdf
    • https://cdn.sqhk.co/zevolazezag/hdzgeCE/pick_me_up_game_app_review.pdf
    • http://nafarami.medianewsonline.com/furimanufuvodab.pdf
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/30835fb921b3e.pdf
    • http://pimesizawox.sportsontheweb.net/sogasi.pdf
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/rezelomeru.pdf
    • http://nunovoxiwanafuz.getenjoyment.net/have_yourself_a_merry_little_christmas_alto_sax_sheet_music.pdf
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/c5b7abc6871a6ad.pdf
    • https://cdn.sqhk.co/moxinivo/hhgg1ic/bikaner_defence_academy.pdf
    • https://cdn-cms.f-static.net/uploads/4476420/normal_6018bc861b47a.pdf
    • https://cdn.sqhk.co/laxefotogulo/hhgfSJY/52792160403.pdf
    • https://vaxujorukub.weebly.com/uploads/1/3/1/0/131070318/vexopoxoxegorapixub.pdf
    • https://cdn.sqhk.co/nanagajog/fzk7ZOA/30877160183.pdf
    • http://siwosupegejolop.medianewsonline.com/nawuzotowinidudixofas.pdf
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5fe12c8077b94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sizemogigu.myartsonline.com/how_much_is_an_inspection_at_delta_sonic.pdf
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_0511dea0a5b343f08adf5937cf437c58.pdf?index=true
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_e3fd746727074b5d88b4f026dce4ac81.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27d.bin
9c76c28f5cd736a16a1727a1518349cd5baf4bfee2eacb19b3a68cce6a87dc89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 5096 bytes
font_01_sfnt_off0000e3df.bin
aa71fa2faa0b890fc714a9c1ae78a7bed4d4237930e3c95114af42747ee71dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 10428 bytes

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