Malicious PDF — malware analysis report

Static analysis result for SHA-256 c455671b461c86b4…

MALICIOUS

PDF

88.0 KB Created: 2021-02-26 19:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e2ee4c585d5ed582ba83437ad45388 SHA-1: e707c39e278002b7aff7b84c9a1b87d0f9488bb8 SHA-256: c455671b461c86b4fa88f261c66989c23faa71efcb7ec8758a985a92124ea070
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It employs a password-protected archive lure, a common technique to evade gateway scanning, and contains numerous links to external PDF files hosted on disposable domains, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, contains keywords related to game hacks, likely serving as a lure to entice users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/wix?keyword=pokemon+go+hack+apk+joystick+ios
    • http://kinatoguvekajux.22web.org/vezosojexesap.pdf
    • http://xuxijosut.sportsontheweb.net/groundwork_of_the_metaphysics_of_morals_publisher.pdf
    • http://nuwiratuzitezep.22web.org/bulksms_for_android_apk.pdf
    • https://cdn.sqhk.co/bawevabob/iVhgSic/fobinezuronabewududubolur.pdf
    • http://sipataj.sportsontheweb.net/allen_bradley_1794-ie8_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_602d39f7a1148.pdf
    • http://vujereki.22web.org/38932547691.pdf
    • http://kupuzuzopojesu.22web.org/air_supply_songs_list.pdf
    • http://kesuvajeb.scienceontheweb.net/flight_of_the_bumblebee_sheet_music_clarinet.pdf
    • http://tapozifokun.mywebcommunity.org/zifabafagi.pdf
    • http://rilomenininun.getenjoyment.net/biroteb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tovedevekep.rf.gd/24824908868.pdf
    • http://rulamiji.onlinewebshop.net/23814233332.pdf
    • http://gawupuzilolo.epizy.com/novecento_baricco_italiano.pdf
    • http://duwemanuwixam.atwebpages.com/kelojadasedabezana.pdf
    • http://wutejaxevewef.myartsonline.com/what_are_48_laws_of_power.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e68.bin
b43826be4f97af9d5cf7d1dc6a87c4da31876fb0a203ed679b0ab34f913c5c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 5252 bytes
font_01_sfnt_off0001202d.bin
f91f4e4e9b1263855d14212a89f11c303e882f7ab418688b8a11a0277a9cef85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 10792 bytes
font_02_sfnt_off000144f1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 4324 bytes

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