Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa512f14eec6b7b…

MALICIOUS

PDF

75.6 KB Created: 2021-01-05 05:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45133725e64ced02e4ea39dd8a1a661f SHA-1: 554e3684fc56dd7d00df67aa22fbdd950c90c1c8 SHA-256: efa512f14eec6b7b29ae4fc9038c017905147f9b84511cb13001269c6174d0a8
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified by both heuristic analysis and a machine learning classifier as malicious. ClamAV also detected the file as a phishing trojan. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary threat appears to be the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=special+purpose+financial+reporting+framework+nz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450034/normal_5fa4ff21b6f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/biejdii/best_movies_on_hulu_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/LLdhigh/9738422685.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/gitipelut/bojijipupiwakananu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/litiguvemipepegopa.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/formal_definition_of_ophthalmology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0480c091-2d3d-4c5e-99b4-1e59b1a42214/jcb_506c_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddce0bd-9103-41ba-8a5f-0ae5c0048a5c/43072988654.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/34931186828.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/fantasy_football_today_podcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d1e5e2-ece9-4cb9-aeb9-a825e4c97991/modubedukotozijiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8614c4-6adb-4516-8ce9-7245c43eef53/tutuviviwijitevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5ae878-1971-4892-a941-d7be5471c42e/lyman_shotshell_reloading_handbook_5th_edition.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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 5524 bytes
SHA-256: 1f3688d33b898a4f1c8a3f0ef0ff10e324e7959574783557d7e6be1a0bea4d6c
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10604 bytes
SHA-256: f0c5413d369219ff19534d6ba86df927f1f4f2b8466ed2b150acc22c003b92f5
font_02_sfnt_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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