Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a1e183dc52b69c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-04 18:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fa0017d84ec17c5fdb12eff3dfa55283 SHA-1: 2504e861a93a033af0eb0abfdf02f1e6d8f7992a SHA-256: b8a1e183dc52b69c4523b736793264dc39d23dd80ea34f604e3addd27a54d75d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick the user into navigating to a malicious site, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?utm_term=how+to+calculate+viscosity+from+shear+stress+and+shear+rate PDF link annotation
    • https://cdn.sqhk.co/nimotixalulo/iasihgi/nokedi.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/hjhchfr/diep._io_tank_sandbox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_6032a952aef6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481513/normal_5fe10569bfb3c.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/idTIjdU/aquarium_fish_tank_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojevevoxo/jbulBib/feudal_system_pyramid_middle_ages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_602b42005fd02.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/V2AO4ij/virginia_snake_identification_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/RYFhmU8/40603633643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_601d059e6f133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602f10c414f46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff0a28eba144.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/b45701ef-a22b-4543-986e-02a925698ec3/no_logo_naomi_klein_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5d97b1-47ab-452b-b243-1b7b11ab0945/is_oracal_631_removable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e96efba-de4e-4e93-b66d-dae1f2cd8155/my_troy_bilt_weed_eater_will_not_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8150c0-19b6-4790-bfd8-ca39e0efeb82/asus_p6x58d-e_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3632b1c-a6b3-439d-8bb5-50e93d85b600/what_is_a_average_sat_score_2019.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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5476 bytes
SHA-256: 278453ecdc92597d6c9098ff625a9be00a15cf304598a3a3d525294a66a2d8fc
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10776 bytes
SHA-256: d8de1ded12febf4fc30360a34ede87ca67779bb45fd1fe06a6f77fb1754cae7b

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