Malicious PDF — malware analysis report

Static analysis result for SHA-256 59aa78bf2e8c7f2c…

MALICIOUS

PDF

76.8 KB Created: 2020-12-24 21:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8c08f4f9179590b1e2b9a3b37a7cd83 SHA-1: 74c4e9a599d847f15cce2e8a2c54818d5e486421 SHA-256: 59aa78bf2e8c7f2cb279abeb0cdb54b33b83ca0a906867eb8dfc318cf2512407
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high-confidence heuristic indicating an advance-fee scam lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of an external URI points to a potential phishing or scamming attempt. The primary IOC is the external URL which is likely part of the scam.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://trafffi.ru/aws?utm_term=camera+canon+t60+manual
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5faec27b348eb.pdf
    • https://cdn-cms.f-static.net/uploads/4529893/normal_5fbdea4ea25b8.pdf
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5f9c4f34e93c8.pdf
    • https://static.s123-cdn-static.com/uploads/4375340/normal_5fc60a4418343.pdf
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5fcea5d5d460d.pdf
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8f45b563fae.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fd68b3c1f137.pdf
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5fc2a91f5e622.pdf
    • https://cdn-cms.f-static.net/uploads/4412607/normal_5f93af59d073c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d60f2e2b-9c3e-45d0-8ab5-f512d11637bb/57075820068.pdf
    • https://uploads.strikinglycdn.com/files/5fe5916d-95ae-4cc0-8bc6-3bde7fd8752e/roxetuneniwevexajopo.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/54787240821.pdf
    • https://s3.amazonaws.com/welutizenop/academic_planning_guide_mckinney_isd.pdf
    • https://uploads.strikinglycdn.com/files/62fd2efb-5a11-4fb2-a594-a1b2954962dc/fm_radio_without_internet_software_download.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/old_indian_currency_notes.pdf
    • https://s3.amazonaws.com/wovitiku/sy_rogers_died.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efca.bin
417439f566e81ae99a1859d29c040c04f964c17cafa66410946a81dfe10685b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 4968 bytes
font_01_sfnt_off0001008e.bin
ae97997b3e5cfa4af621788fbff87e645fd66bedae99c752d8c3690c54bef3ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 11124 bytes