Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a015407199c49e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1118155c1dce603cf80bd87ef3faaad0 SHA-1: 5c054086b4d5fdd8898f63be0f0c1b5c51245326 SHA-256: 86a015407199c49e1b4bfae6fa2437615fea3d2dec19af1c019291acfdca734d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malicious redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, suggesting the document is designed to funnel users to potentially harmful content. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=yachting+salary+guide
    • http://warupipujamoru.sportsontheweb.net/labanumesuzi.pdf
    • http://woziwowariv.sportsontheweb.net/98282789741.pdf
    • http://sendgrid-de.com/zelda_ocarina_of_time_master_quest_gamecube_iso_frk7g6o.pdf
    • http://powajaxib.medianewsonline.com/85284391930.pdf
    • http://zoneeuro.pro/gumaloledopabavegetuwedaszaml.pdf
    • http://sukuwodexi.scienceontheweb.net/62456237937.pdf
    • https://xolojafiwonizup.weebly.com/uploads/1/3/5/9/135966724/2707464.pdf
    • http://nibewubixela.getenjoyment.net/zorojaxevomewon.pdf
    • https://bakabita.weebly.com/uploads/1/3/5/3/135309819/007ea33a6199.pdf
    • http://fekevopimibun.sportsontheweb.net/manual_de_bolsillo_acls_2020_espaol.pdf
    • http://nogurufegu.mygamesonline.org/77615379089.pdf
    • http://lubenoredeji.mypressonline.com/the_universe_has_you_quotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/robumuduluwise/25953096549.pdf
    • https://s3.amazonaws.com/wefadep/candide_voltaire_chapter_5_summary.pdf
    • http://gipebevu.atwebpages.com/90736368906.pdf
    • https://s3.amazonaws.com/sazixipame/special_26_movie_akshay_kumar.pdf
    • https://uploads.strikinglycdn.com/files/860053e5-87cc-4dac-b3cc-6326accd744b/68626707437.pdf
    • https://s3.amazonaws.com/retisovojor/culture_of_honor_danny_silk.pdf
    • https://uploads.strikinglycdn.com/files/18302087-1975-4a7c-869e-245e3d1661b6/pamajixojunawu.pdf
    • 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_off0000eafc.bin
cc3b90510aac012b0a892dfb771472d756cb29b619b1f2b25f31fbd8adb417b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5264 bytes
font_01_sfnt_off0000fce5.bin
e8d9d655d15e9f2c409311631d6a23855ff984c0da5631782acbfb5928863f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 11232 bytes

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