Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5985995b042fd8…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 09:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a2e9557e9376611a3e938be85d16a6a SHA-1: 5f8f9b4052f28ea8b550c4bafb403dc4fa0a1b76 SHA-256: ac5985995b042fd839c3559ffaa1ff1f7838a014c5fcb57b409acb1ffe39699a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'trigeminal neuralgia patient information'.

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://dugedepap.ru/award?keyword=trigeminal+neuralgia+patient+information+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419640/normal_6061f29c4a4b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484641/normal_5ff159d5ec39b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_6032a0770f4fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5ff3694625f3f.pdfIn PDF document text
    • https://cdn.sqhk.co/jategesil/ighgVja/boule_de_suif_analyse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425728/normal_5ff96391b9c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_604b7adc5dddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_605d728698f88.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/75ejcFw/economist_intelligence_unit_internship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_6007620790805.pdfIn PDF document text
    • https://cdn.sqhk.co/xudogafu/c20ggc0/wowus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_60027e3e584e1.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/78496e12-fb32-458e-92c3-d549b92e31d0/what_caused_absolutism_in_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4a98ad-afea-4329-8219-b92d88f65338/25619002082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f3a0c8-f445-49cf-9f15-ff03388e5c55/types_of_marriage_in_indian_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/505eae89-19b2-42f6-b435-9a737d821e7a/muteledu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93be0c29-040c-49d7-a6f5-c2953bd6cf1e/what_battery_do_g_shocks_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7842d1d0-819c-40f9-ad2e-9f34de80520b/finding_interior_angles_of_regular_polygons_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cbf237-8c99-44bc-a68a-4ae27f79b137/91371603660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2093d398-95a4-4a59-8f51-8b86954c9751/xugib.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_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 5132 bytes
SHA-256: e30ebb1caee8dc26e756002ef2fed19f95a66849bd919481703c52b53063adc6
font_01_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 10828 bytes
SHA-256: fae2a68653887a7322e73a07b8e2aa7079487311df7d60a2f2aa95ac5e2758d8

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