Malicious PDF — malware analysis report

Static analysis result for SHA-256 d690e87d71ac4052…

MALICIOUS

PDF

72.8 KB Created: 2021-05-29 04:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 1ffe1ad0d49962596aa9189573da47ab SHA-1: 8a431b8448c2d4a1c1cd2cdc1a64a4217de4e85e SHA-256: d690e87d71ac40528777b3cbaf52778d39f10e28f1a73ea3e7287a4656dd3e20
104 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, one of which is a direct download link, suggesting an attempt to trick the user into downloading a secondary payload. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/123?utm_term=bbc+news+app+free PDF link annotation
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/romijefetixeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_5fd2586303f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_600bb7f89638b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_6031cb284001c.pdfIn PDF document text
    • https://vojufeluwa.weebly.com/uploads/1/3/2/6/132681665/2478298.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/6739877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd2f80a18396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_6063d46e794cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_60112eeb6320c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6016211c488a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366377/normal_6000750d4bf28.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/79f9e9fe-a409-443d-ab2c-941592667e0c/35268518699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ce8eac-c80d-4843-a64e-69c060786370/81181946300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b87f13f-a793-4d9c-a4e1-b31803000554/apk_obb_psiphon_249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02b729c-d01c-4197-908b-c79a0aa17720/kuxisipofodumiwelepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec65ff35-4a05-4699-8ca2-0bebcb784cad/business_communication_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4af1867-5d14-4889-b61c-ac3e30bfa914/equalizer_e2_weight_distribution_hitch_installation.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 5260 bytes
SHA-256: dc8f8a4425b90db576c981a557332e9e25d591f28f7188ba835e667bf571642b
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 11124 bytes
SHA-256: cafada31d5ba7295bfaf59a63f629870d09375e922cbab8db67857a6a589e71c

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