Malicious PDF — malware analysis report

Static analysis result for SHA-256 1939ef57659aa4fb…

MALICIOUS

PDF

77.7 KB Created: 2021-03-09 02:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f00c548633792bdb0d8311e792ce9b34 SHA-1: a07b8a716dbb81b34d5702c35563b1558a13ab87 SHA-256: 1939ef57659aa4fbfe306aef8d032031a6e0f1979698e30d4946ee07bd368c88
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a URL that claims to offer audio drivers. This is a common social engineering tactic to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=audio+drivers+windows+7+ultimate+64+bit+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374380/normal_6002bb8366e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6014d0b5449c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fe63131beaf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd76f32134b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_600d78d2df364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_6031fb433e515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_603341b28ca5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_602ef28eee9c3.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/e8d9e0fb-4214-46ee-99f3-b3c831b004e4/fidalewowuwenerazeboto.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/lemebirem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f85b56-8c10-49b8-9706-78f4920570a4/12476726142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0731cf0f-ebee-4e4c-8aef-752fd2b4c388/nubije.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/age_of_empires_2_no_cd.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/bodisetuvorafagefirobe.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/free_animated_infographics_templates_after_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f768841-fe6c-4a52-8c2e-3e5866956d43/what_is_the_difference_between_weber_spirit_and_genesis_grills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0956e0fb-3037-4650-b31a-1c24ac62b0c3/paloto.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/new_era_fitted_cap_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/30720881890.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/flyff_insanity_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/resevifedazalis.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/aperture_camera_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/school_bookkeeper_interview_questions_and_answers.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_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 5656 bytes
SHA-256: 6c5f6427e668967e719cba6b3953669df95c05944b3b6d1cea4fd4670cec52ca
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 10108 bytes
SHA-256: ecff6097e1cd23eb19d2c9d86d969bba316b8590fb8f920292c10724ed893163

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