Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b186146c78c03b…

MALICIOUS

PDF

204.7 KB Created: 2021-05-25 07:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03be56eaa840d60138d2bdb69046c8d2 SHA-1: 792afcb276457536f130c6c97196ed26eff95749 SHA-256: 28b186146c78c03bb160df11d06981c7ea470c824811d5c14fa5e2ee5f657334
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely as part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain metadata related to a product specification, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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/wb?keyword=asus%20xonar%20dgx%20specification PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459054/normal_604d14038b906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6046e3e449f8a.pdfIn PDF document text
    • https://pojamemurix.weebly.com/uploads/1/3/1/4/131408024/ef831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_6014d5052eaa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_601613311e796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_60503e7e79395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5ffe48636a7e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5ffcf6da6caa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409107/normal_5fcfa62dcdb8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_60563749efd66.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/3632686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_606a35fe84c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_6023e901b377b.pdfIn PDF document text
    • https://rutaluxunenore.weebly.com/uploads/1/3/0/7/130740368/8600555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5ff9128d44f90.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/jegag_tuvukisida_vagewukijoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fef7184cbd5f.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/209edfd0-ac70-445b-bef5-1c0808a6a146/64363361859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d838a318-ebc0-4121-8e60-b373afd0e8a2/brother_mfc-j410w_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/hike_guide_website.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/64993581963.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/10532862747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb5a0a9-fe3e-42e3-a4db-d242892b5034/r_programming_book.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
stream_002_off00016c27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16C27 131176 bytes
SHA-256: b2abdc93cdca474fe60a01c97ce5699bb8c8be799adaf4744866f3d85e40c9b4
font_01_sfnt_off0002ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECBE 5348 bytes
SHA-256: 1beb86673ea0b4305b22ce600a16c0cf1c583c93cb321f88aa2b066d5f9d2023
font_02_sfnt_off0002ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF07 11260 bytes
SHA-256: b66cfa15558ff349b218262deb723e737e67e0804dc7b5ab7300ae42abac1443

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