Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b9b3665bfe0343…

MALICIOUS

PDF

71.0 KB Created: 2021-01-05 23:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5373fe0b6e84bc4a2cc3a22e987abc6d SHA-1: bb34b8b1e5d399fbd17f03891e2f6ff333c7d0c4 SHA-256: b1b9b3665bfe0343b3430b73adee00a90df3ee9b99983a090cecf07414e8f9f6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference game-related content, likely as a lure to direct users to the primary malicious URL.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=sword+art+online+hollow+fragment+cg+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5fcbecf22b94f.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/6481410.pdfIn PDF document text
    • https://puvugemamoj.weebly.com/uploads/1/3/0/9/130969199/d359d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5fd26bfaf2d4a.pdfIn PDF document text
    • https://cdn.sqhk.co/zawafolor/PLIvejd/ny_company_stores.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/tatetip.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/rekawexuretowo/introduction_to_sociology_anthony_giddens_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/catholic_saints_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/55746027711.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/rerefogaripuloluze.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/puzivuponifusosel.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/panasonic_kx-tg6641_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/wunavokizorinamisum.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_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 5332 bytes
SHA-256: dbe0d837339a767c7b1c95a40149252d0b5075b4a082370913817cbf58d792a6
font_01_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 10880 bytes
SHA-256: cb9d29bfad3632fdfa492efac9be192e9653d9fa47d3325299d7363ac5e0b74b
font_02_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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