Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7393a459eecc96…

MALICIOUS

PDF

77.7 KB Created: 2021-04-26 04:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb2286a4942611fde3b930608a65b2c3 SHA-1: e936928be2936397e440a123b4aabdddf637f77a SHA-256: de7393a459eecc96586911ccd33bf05264962874903feca5c4aeea3e801cb796
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of multiple external links and the heuristic analysis suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=troy+bilt+mustang+xp+50+drive+belt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476758/normal_6048392dc27c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450042/normal_5fdfc507548b4.pdfIn PDF document text
    • http://zeridojatis.iblogger.org/business_analysis_skills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_60013368e2954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_601eed13bc548.pdfIn PDF document text
    • http://baxosemot.iblogger.org/97679675865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_5ff5552feba6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_6011fb5227bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601ae4000547a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_600bfd7a52cfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_60002d670f157.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/64f36e92-233f-46e4-b310-322ca47ba6ad/john_deere_455_service_manual.pdfIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_9a184821e87a44ec959e48e4d20cd7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94236341-51bb-4e97-997f-ee0082eab933/57151444250.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_a34903cbea024b36a630a4797428f142.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b943c93-0655-404b-b3e5-0770eeb9095f/63801910022.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_0b57126ee55f4b9ca4e8145121dd5375.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_9ebee5acd8014187b55abf3d140707ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71944cf4-019d-43ca-8ef2-e141407f6ecc/87233500616.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_4e2530cfde064acb9129421810a5f57e.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_aca44a773f774bf691cc8f0da243e232.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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 5864 bytes
SHA-256: f5faaed67ffe1ff77b034ef399c81ede56f58fccd5a077710b629980d5db8aed
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 11188 bytes
SHA-256: d313c4f5f3431400b839a5ca7e1711f230d686cdb19a3fae1f1179dde44dc5ae