Malicious PDF — malware analysis report

Static analysis result for SHA-256 99469d0d0b8503ea…

MALICIOUS

PDF

68.5 KB Created: 2021-02-10 10:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 33d7f3d3887ec9acd6581a5d879d08bc SHA-1: e1ea6b7170c7c98da4c0bcd5b7ad9e61e02de246 SHA-256: 99469d0d0b8503eab78fd279af6b231f849923eb36e5deb5e5b084058a9d1b1a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with the primary one being 'https://maypoin.ru/123?utm_term=a+civil+action+book+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=a+civil+action+book+pdf PDF link annotation
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/9783938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fce90650b432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_601b479abab39.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/8789d284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_5fe74b9dd002c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fe65e8517b7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383300/normal_5ff70ef5cad9b.pdfIn PDF document text
    • http://usesol.xyz/tevimizasuramopukuzedarol8cwpr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liguwubore/gba_emulator_ios_games.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/cowboy_bebop_sheet_music_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/barbie_games_to_and_play.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/nisuponu.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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 5128 bytes
SHA-256: 951fe25ce05bb3915f771407feb2cd687635a20514082d9cde3a31e36b111687
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 10384 bytes
SHA-256: b7892f9f63734b11f3c3e6cbb8124d1af2f8006f4be6f08a070cbe45e9e6875f

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