Malicious PDF — malware analysis report

Static analysis result for SHA-256 a790f9cc62e28848…

MALICIOUS

PDF

66.1 KB Created: 2021-03-01 04:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f50a8810d5ecd5f8bb9594ff6926b646 SHA-1: 9fc6bca241d7c876e1bc0014fc58b2ef9cda3a6a SHA-256: a790f9cc62e288489482b43416fbb7393fb8e4955278fdda3fb69438381ece7d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jumiwimov.ru/award?keyword=uniden+bearcat+scanner+bc145xl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5fd09b55dfc4c.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/gyFdgxn/nail_art_and_spa_farragut_tn.pdfIn PDF document text
    • http://1gusevshop.space/movie_telugu_2018_hdbo5vq.pdfIn PDF document text
    • http://karaulovlife.site/53559365833apljt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_6018d7780df0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6026207f220af.pdfIn PDF document text
    • http://oneshops.space/74280774943bd6ty.pdfIn PDF document text
    • http://mon-compte-cmb.best/how_to_use_the_adt_remotemugzr.pdfIn PDF document text
    • http://shopwithsale.website/applied_artificial_intelligenceu12ls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ff86a2767fa3.pdfIn PDF document text
    • http://xosuvirakogaf.iblogger.org/9625699923.pdfIn PDF document text
    • http://jsexj.fun/classic_word_gamei9c4t.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/budovewesekaz/music_behnam_bani_vay_dele_bighararam.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_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 5076 bytes
SHA-256: 179f2f3eeba227a714f9d4b8f6a72130bae775d56e70c7770f84d9178d0b9311
font_01_sfnt_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 9672 bytes
SHA-256: 4ab4c85c3657e6eb5ab36ac104813ee0dfa9e6f817649895899af1634a4f8418
font_02_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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