Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff77ef2051d70628…

MALICIOUS

PDF

79.0 KB Created: 2021-05-16 12:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 87eda73b50ce293f2eb7eaad141df5dc SHA-1: 9ff4c67c6edbf5c3d1f4a4d25abe54a42138fafe SHA-256: ff77ef2051d70628697105bb37dfd4263e3b7bda7c0af9f72d6dcfa960674c7a
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to diesel engine repair, which is a common tactic for phishing or malware delivery. It embeds a URL pointing to 'fokemale.ru', a domain flagged as suspicious, likely serving as a landing page or a redirector for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/strik?utm_term=how+to+repair+a+diesel+engine+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6025138f540b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_600829e5cb980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_60449f50a58e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5fe259863d403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_60526453e001c.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/301c0465-eb1c-4923-8304-2808f6ef9a5f/in_the_time_of_the_butterflies_quotes_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b653ca4-1246-47e6-a6f1-92a6c8ea3efa/hamilton_beach_brewstation_12_cup_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d998ca80-118e-40cd-b162-f4f4143246e7/united_colors_of_benetton_watch_price_list_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364ccb0f-28e4-4e6f-8649-cdc0a1c681c7/photography_changes_everything_marvin_heiferman_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/wapozemoribulupivobizoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4153cc4-cea1-4dd1-bfa2-5959d7007e4b/homedics_531_scale_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2add7e-048a-4700-85ec-bfafe51b1e17/jilegufejamowomufisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e028c1b2-b8e0-4e0c-92f2-f5e3cb719cbd/26013509216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f28e106-451d-4862-b8f7-1201a3a43c73/is_mechanical_engineering_in_demand.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/kusititigugezenaxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282afe2f-36e3-4684-8804-859eb7aff878/3441386324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b813da-0bc2-49f8-9e2a-a5ea95c91706/how_to_request_an_autopsy_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ceed535-f5f9-4e0a-999a-4669c7c65e81/temobixufuteredunavumomi.pdfIn 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_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 5180 bytes
SHA-256: de3f95d199467f17bff5a82060fdef5f3a0c0dcfa431d9d13401e4de56cde501
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 11224 bytes
SHA-256: 4e55a141f78eca6c8a169a13c8199f0de4065a779a3f46507dd45c50c4f3067c

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