Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beef830c085da1f…

MALICIOUS

PDF

69.1 KB Created: 2021-03-15 11:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09df5284d3b1318972867a8863c7e0fc SHA-1: ed89c0ff11c9110d8ca4bbd013eb7fe8633483cf SHA-256: 8beef830c085da1f305b2d22d2fb1d0ffbe4b98b131a38a359a766813c8115da
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://dafemum.ru/award?keyword=amigos+para+siempre+nuty+pdf', is directly associated with the malicious classification. The ML classifier and ClamAV also strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/award?keyword=amigos+para+siempre+nuty+pdf
    • https://cdn-cms.f-static.net/uploads/4384316/normal_602a4fcbd8896.pdf
    • http://leftoutclub.com/7130441160c31su.pdf
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fccb667a7c51.pdf
    • http://wide-take.top/vomozidesumutegiraltgh9v.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_601dbaf93ceeb.pdf
    • https://cdn-cms.f-static.net/uploads/4382413/normal_6017682adeefc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bitajemisajoz/what_are_halogens_on_the_periodic_table.pdf
    • https://s3.amazonaws.com/faluzotixupi/metric_conversion_sheet_1.pdf
    • https://s3.amazonaws.com/bisapovepizaj/bixaxoxujexeganipofebuko.pdf
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_2b0edf794aac4ee4bf8d8dae4b77e193.pdf?index=true
    • https://s3.amazonaws.com/tinivukedeta/81677330112.pdf
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_c9c19880fdfb4fd3bf9a050f1aa17beb.pdf?index=true
    • https://s3.amazonaws.com/bokofapig/how_to_use_the_standard_normal_probability_table.pdf
    • https://uploads.strikinglycdn.com/files/600bf31e-1764-47ee-b412-072a2f558c9c/unity_software_stock_ipo.pdf
    • https://uploads.strikinglycdn.com/files/79845bc3-2f84-42f4-b680-6a15d2a45ef9/sat_subject_tests_dates.pdf
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_34dd60dcf39c4066963619ba7a7163f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/550f91a0-02e9-408e-93a0-3d990d8f2047/funny_poems_about_video_games.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_6aa00b674bc7400c9fad1659ca8329cb.pdf?index=true
    • 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_off0000cf6f.bin
9a187f13c4114d6cdd4a06150a9b4f619f2e2a45250232fe0e3f5d0d81da672d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 5420 bytes
font_01_sfnt_off0000e1d6.bin
d4c1d469e4346d1aaaa558c54ca53731262021e04a6fe85ac9e60ef64d66ec77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 11076 bytes

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