Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bfa3e53d007460…

MALICIOUS

PDF

135.5 KB Created: 2021-04-01 09:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 42ba019c4036abd3575a70439540c790 SHA-1: d547409d84d644d88be83002867892e5966993f2 SHA-256: 55bfa3e53d00746063f4942f344b1f2c2fde67ffd562b25c540074db517eb848
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that directs users to a suspicious domain, likely 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 heuristic suggest an attempt to exploit users by presenting a lure related to technical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/award?keyword=op+amp+circuits+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472208/normal_6041b629afefa.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/avelle_convatec.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/jicGhhD/transmission_fluid_check_hot_or_cold.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_60052e0851bc0.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/29593066211.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/ggjcdKr/lurikidoxigabunowogidi.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/ihagjha/bogozurewilizotuzodoxomu.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/riponezonugusikabagizif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_6031ceb224351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rodiligarexo/8653283000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d4b9d6-88e9-41f5-a46b-80ad405fbf57/how_to_pair_mini_jambox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551eaeb8-94e0-4fad-a90b-9a9a033d8446/how_to_day_trade_crypto_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/26539584926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0c22be-93aa-4127-a435-b7918aa1dfee/60559469279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58432add-1989-43ff-b0ca-17228877f4b5/delonghi_nespresso_lattissima_touch_en560_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e0a8a2-b321-4f89-aa2a-7c28d5978232/30_under_30_uk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf330e0-6ecb-4f60-9545-aa34faa94110/dekununud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df88acb6-2d66-40d7-aac8-7ab060fba194/gugosijulegemevudaja.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/complete_calisthenics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/kipedifukejulas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B9 4844 bytes
SHA-256: 0f3868c518a5a6d80eb13f5cd038b1d38ae043ce800b76708886d89ed4dd3371
font_01_sfnt_off0001d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D629 12960 bytes
SHA-256: 40352d52a154ffb3a6e942517670094554fcb756bf9a91f03c754f8c3259cc8f
font_02_sfnt_off000201f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201F2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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