Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c167d8f22414e0…

MALICIOUS

PDF

78.3 KB Created: 2021-04-20 11:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96213e9c1d3a1a49f31abd59f71a8c99 SHA-1: 83ff4bab7012ca3770af85f446a4d349be259724 SHA-256: c2c167d8f22414e037d951e5f8a95ca16b5fae001213f70ae95c0fbe3169f7cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware delivery attempt.

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://botokaw.ru/strik?utm_term=sims+3+pets+ps3+dlc
    • http://kitafoged.medianewsonline.com/skywalker_trampoline_replacement_parts.pdf
    • http://jijipefifi.iblogger.org/sajarusivabigoxafuzoro.pdf
    • http://tevfikyuce.xyz/html_inline_css_link_colorgb465.pdf
    • http://juvovagesubo.mywebcommunity.org/29136053035.pdf
    • http://lifeshop.pro/3024683614lde3m.pdf
    • http://d2-club.ru/what_is_the_house_of_night_series_aboutbkmqn.pdf
    • http://wonizojaru.scienceontheweb.net/bsc_computer_science_books_free_download.pdf
    • http://fazupefejivujuf.iblogger.org/formal_business_email_sample.pdf
    • http://limaxinsto.xyz/franchise_disclosure_document_sample77iy4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d7effc903dd140f1bafbd7a8a0d87ea2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39bbff79-1ce6-404b-9783-e7182e0ebd3d/best_bread_machine_recipes_using_all_purpose_flour.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_afdd6f434f3544fe86a8547210a6c784.pdf?index=true
    • http://laniferes.epizy.com/dajukojiguxududesipupi.pdf
    • https://uploads.strikinglycdn.com/files/022d3f2b-3b39-4df2-9a3a-2b164802e66c/boss_br_900cd_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/7186d4af-5053-4904-aa4c-9b19c763a94f/blood_bowl_turnover_rules.pdf
    • http://zudupaxub.myartsonline.com/55307627123.pdf
    • https://uploads.strikinglycdn.com/files/58a6980f-17c9-4679-b4e8-c8348ef66280/30551874415.pdf
    • https://uploads.strikinglycdn.com/files/1a4ffa2d-55cc-4b95-8680-11e637644eb7/rival_ice_cream_maker_gc8151.pdf
    • http://kikukuvikato.myartsonline.com/bsc_chemistry_syllabus.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_off0000f569.bin
3e31bd963953b8a071425d7ee70b6e0d9698672ed8704be407d086ac11d5e8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 5180 bytes
font_01_sfnt_off000106fc.bin
36db5a33f202587891ebec847f59334770dbc285c5ead04a1eac7400a5dd926c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 10952 bytes

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