Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8b3157af116d37…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 23:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d49766f91a680c93d67960b780b1e8be SHA-1: 1fa3a6a861836464bb476441fe985fc3f3f5554d SHA-256: 5c8b3157af116d37eaef3810237b1fce4f5f6d06eb70e933d380f9c8b3c88b1a
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, suggesting it acts as a link farm to distribute malicious content or phish for credentials. The document body, though heavily obfuscated, appears to be related to academic materials, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=gate+2020+ece+question+paper+with+solution+pdf+ace+academy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477638/normal_601edca1a4101.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jarjbhj/99355156466.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/idvchiT/3d_planets_model.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_6004f365debc2.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ilhi2cz/rolling_stones_album_covers_1960s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423462/normal_5feb494268fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_603ad1bda055c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_6004b77c3a662.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/jSCrtgf/21442658556.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/rhdtKjc/12624716736.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/e5745c9e-c7cc-4c05-86d8-e9ee4b01ae26/zisitidogesorudofudo.pdfIn PDF document text
    • http://munepej.rf.gd/86832022686.pdfIn PDF document text
    • http://kanisal.epizy.com/saborevafenadufufir.pdfIn PDF document text
    • http://wurozuvejesubot.epizy.com/kofesozojodukepidetulaka.pdfIn PDF document text
    • http://jotizepexul.epizy.com/liwuxekibazuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f1b551-7769-4a6a-94f4-da4982464f11/interior_design_trends_2021_colors.pdfIn PDF document text
    • http://pidupabujufug.rf.gd/43808788620.pdfIn PDF document text
    • http://rodever.rf.gd/23492421740.pdfIn PDF document text
    • http://roginopirut.epizy.com/cute_ringtones_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91276434-6d6f-4679-96dd-df655da22c0b/snow_like_ashes.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_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 6020 bytes
SHA-256: 06d4e2d5a662970d55ffefa715a1771725c836209f0f81c0ed9d2cb8c99ede55
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 1728 bytes
SHA-256: d165ae4d83dd613087195bf72709767423eba952415580ff8d315dee306433fc
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10980 bytes
SHA-256: a518dbfbd2b13a1b1974a8c8b3ffb187657d0ddbadf1565c91456738aad7863d

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