Malicious PDF — malware analysis report

Static analysis result for SHA-256 a893a5a4465d9338…

MALICIOUS

PDF

72.7 KB Created: 2021-01-22 00:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 695c3d791ea2019df3b910e1625d2af7 SHA-1: b89dc6f4d5dc540a2d1f045294029954fc45f330 SHA-256: a893a5a4465d93387201e4459b4b003b70b84136ec78f05fcf0f2d5737c38861
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though heavily obfuscated, appears to contain a lure related to baseball game length, directing users to a suspicious domain. The presence of numerous external URIs and the link farm heuristic suggest a phishing or malware distribution attempt.

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 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
  • 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://crophysi.ru/123?utm_term=how+long+is+the+average+pro+baseball+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5ffb6bbab543b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5ff92724b9141.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/9174403.pdfIn PDF document text
    • http://sigonalen.22web.org/gazut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fcccdc36e1a5.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/aBijihJ/pedewem.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/funerukefadife_puzejumezuwete_febegubedi_raritumun.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/muwunubiwefilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fe6b819ee1d7.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/212b6755af74428.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/zuvovoxigumuz/angadi_theru_movie_songs_free_starmusiq.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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5484 bytes
SHA-256: b32bff3c4432a767a01c7931e4d3ee984545b93a8f24eaab6f567da30add56db
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 10708 bytes
SHA-256: 837a9aeb7b6b7124647144ffaafd4a2bdc1e9112c4c3126d4e060baca7592239

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