Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceda83c04a8ad52d…

MALICIOUS

PDF

112.8 KB Created: 2021-03-17 21:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66df446023efa01b6ee69822bb1549a7 SHA-1: 7f639a7ba4a6d2b15c90a1605a1ed30fb90580ea SHA-256: ceda83c04a8ad52d4eded2a7a4aba0f578baa398bb95efeb9e3482ea8f439013
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 redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the document likely serving as a lure for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=ias+14+segment+reporting
    • https://cdn-cms.f-static.net/uploads/4494417/normal_5fd6c7c99194a.pdf
    • https://vogifidawavuda.weebly.com/uploads/1/3/1/6/131636702/mibarema_vujiki_xozatereb.pdf
    • https://jajujawu.weebly.com/uploads/1/3/0/8/130813132/ad5649a32cf4.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_604180d31fd50.pdf
    • http://hushseo.online/world_history_book_freekgdz9.pdf
    • http://iranomics.com/prodot_antivirus_for_windows_109e91o.pdf
    • https://cdn-cms.f-static.net/uploads/4470400/normal_600ff3b5c581e.pdf
    • https://cdn-cms.f-static.net/uploads/4489975/normal_602e382ce9367.pdf
    • http://mevukavotidu.getenjoyment.net/maze_runner_scorch_trials_full_movie.pdf
    • https://static.s123-cdn-static.com/uploads/4471484/normal_5ff277acf1500.pdf
    • https://gebuluwit.weebly.com/uploads/1/3/4/7/134767861/wakaxuw.pdf
    • https://static.s123-cdn-static.com/uploads/4447631/normal_600494e2c5cc0.pdf
    • https://cdn-cms.f-static.net/uploads/4454277/normal_5fd6ef7d25541.pdf
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5fd8844b0b5ee.pdf
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fef63c9d3048.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_66c899adedd84811b6e67191c78af6cd.pdf?index=true
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_0ae5c461cf414c2aade38b5a423d5819.pdf?index=true
    • http://napamewa.atwebpages.com/compuestos_organicos_e_inorganicos_de_la_celula.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_461bf494d6fd4fcea532450adea90ab7.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_96104ec5a4f2449ea4846a2206977b75.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_1f39e6d0504842b48fc0f47fb58b1f81.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_off00017af7.bin
7e276b26d4bc28118da2633a7596d708a5cbe3e13c582d7a9899ca3648d6a710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF7 5184 bytes
font_01_sfnt_off00018c93.bin
59d511d982697d258fad4673197a7642571845676f74d07aca490fe294e90831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C93 13236 bytes

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