Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1837ef1e373b0fa…

MALICIOUS

PDF

94.3 KB Created: 2021-03-20 23:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a15946b07627bf2c05e1b98f54efc1b9 SHA-1: 20361db011a889ba223b0fb15b7b048732dac800 SHA-256: c1837ef1e373b0faea67a8f20aa53a92c1548926b84c7f16fabe50cad4ce318e
144 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are presented as search results for various manuals and documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9509

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/award?keyword=briggs+and+stratton+engine+manual+pdf PDF link annotation
    • http://cardioactiveitalia.site/neato_botvac_d3_side_brushv7q3e.pdfIn PDF document text
    • http://didazema.mypressonline.com/9491222799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_6005e02da6da5.pdfIn PDF document text
    • http://tryplafond.xyz/white_tiger_hindi_movie_ploth90to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_602addcee79c1.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/sobedusijekitex.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/best_free_guitar_lessons_online_reddit.pdfIn PDF document text
    • http://1eyvgo.xyz/apprendre_le_russe_lecon_3kq5gl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_604f8ca02aa64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_60098973e016a.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/kobalt_12_dual_bevel_miter_saw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/gZhi9jf/daxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/hejhgfy/bizzy_body_remix_by_psquare.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/EoShfhe/amazon_goes_gold_2019_leipzig.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/1ecfe6a3-f2ac-42a2-8a3b-34e49fa7072c/piveduko.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/frozen_flower_2008.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/hp_deskjet_f4280_black_ink_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/58809965626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0276a1e-d415-4de5-8b22-9e5170242764/25683689083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eccf6cd-5d5c-4816-8048-241e354fef3c/how_to_troubleshoot_a_tv.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 5408 bytes
SHA-256: f4b4874cd2e36cb06c08eaba6b86df073dfe32ddbfc279d84958ca38282ef75e

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