Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2058a197d6a7376…

MALICIOUS

PDF

80.0 KB Created: 2021-06-01 01:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71cc56f5a0e63f5c6fe3df6f8310ac60 SHA-1: bc3d96a5697508deedc329a3fe17752cd23e0a19 SHA-256: d2058a197d6a7376b1e8a15bff1d7accb8e16cdf31efb47bb6d79e0e167ad65c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, with one prominent link pointing to 'irlanc.ru', suggesting a phishing or spam campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/pbw?utm_term=how+to+make+a+good+behaviour+chart
    • https://cdn-cms.f-static.net/uploads/4465403/normal_6067799f7ba8e.pdf
    • https://koledino.weebly.com/uploads/1/3/4/3/134332835/giporaxunuva_kotetugazo_gegekami.pdf
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fe03d424f619.pdf
    • https://cdn-cms.f-static.net/uploads/4426686/normal_60176ebe733d5.pdf
    • https://cdn-cms.f-static.net/uploads/4408976/normal_6051dfd07188e.pdf
    • https://static.s123-cdn-static-d.com/uploads/4470826/normal_60b417bc7f8b0.pdf
    • https://cdn-cms.f-static.net/uploads/4421983/normal_6037c165a6d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4472501/normal_605c362c9d6a8.pdf
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/8616129.pdf
    • https://moniraje.weebly.com/uploads/1/3/1/4/131438162/mobenotulusugur.pdf
    • https://pimejowutaviju.weebly.com/uploads/1/3/4/4/134495028/1550640.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6033a4cde20f2.pdf
    • https://cdn-cms.f-static.net/uploads/4479454/normal_601ae13aa0f6c.pdf
    • https://cdn-cms.f-static.net/uploads/4485156/normal_604ca0c35605a.pdf
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/526910.pdf
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcf60ce2b9ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3296a3db-7148-4822-bc8c-b00b0581f70e/como_recuperar_os_contatos_do_celular_pelo_gmail.pdf
    • http://kokoxudalux.pbworks.com/w/file/fetch/144429048/14745789593.pdf
    • http://papoxuva.pbworks.com/w/file/fetch/144425208/70320694802.pdf
    • https://uploads.strikinglycdn.com/files/877f8f36-5a7d-4f5f-973b-d9e4edcf44c4/dias_feriados_en_2020_mexico.pdf
    • https://uploads.strikinglycdn.com/files/5145cabc-283e-428a-8029-ba9865fddfa8/56027551457.pdf
    • http://ruwezebom.pbworks.com/f/best_pellets_for_crosman_760.pdf
    • http://xuruzinijub.pbworks.com/w/file/fetch/144428505/how_to_check_vehicle_fines_online.pdf
    • http://pezeliv.pbworks.com/w/file/fetch/144426198/24238008957.pdf
    • 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_off0000fa77.bin
339cea3e19260dec8020eaea4c5d7e1183891116b336461714d50900995f47f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 5460 bytes
font_01_sfnt_off00010cf2.bin
da4581a54d25a4f4ff25b9335e96cfefac7d0b0c09cbcd1bcca61e132aae7b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 10404 bytes

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