Malicious PDF — malware analysis report

Static analysis result for SHA-256 db03180b997027f3…

MALICIOUS

PDF

79.6 KB Created: 2021-02-12 08:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a87712725b6b25c39008221e96da14bd SHA-1: 5934f7b9db42cce035027fa397a382291bc7a43e SHA-256: db03180b997027f3a3ee8eb958e46d58a36e3bb833c953017939573bdb699c41
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 critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and disguised as game-related downloads, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://jottigo.ru/wix?keyword=ps4+all+games+apk PDF link annotation
    • https://cdn.sqhk.co/donuvoduvedo/ogjbIqz/merge_round_racers.pdfIn PDF document text
    • https://cdn.sqhk.co/tojorovexuw/ddjhyce/carx_drift_racing_simulator_mod_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/f6giijb/horror_nights_story.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/jfM1hgk/62569621334.pdfIn PDF document text
    • http://bonusiotsbera.online/45051889302bkkdl.pdfIn PDF document text
    • http://ygrash.website/8366351370za3hl.pdfIn PDF document text
    • http://chuvashovfamily.ru/12869405592zdlvl.pdfIn PDF document text
    • http://aarbuz.space/adobe_premiere_2014_kuyhaara6xz.pdfIn PDF document text
    • https://cdn.sqhk.co/najuvotuwoz/OhfFjbA/18378858545.pdfIn PDF document text
    • http://svoylend.xyz/621410253972vnpu.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/Fdjc0GE/nedumumu.pdfIn PDF document text
    • http://coolvdomaion.online/sesixisigazezovujorod3bw3.pdfIn PDF document text
    • http://cosmicgig.com/boxotelotixivx2cb1.pdfIn PDF document text
    • http://cleanup-sale.site/6706408812nyix6.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/edPzhgN/mp3_player_download_music_youtube.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/86273834303.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/dgfBzgi/vapig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefagukolile.epizy.com/an_inspector_calls_quotes_and_analysis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 5196 bytes
SHA-256: 69a316a6ddcbe4ce551437741a244e195b96b20ec3b6b4ed00875a5a86f401bb
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10440 bytes
SHA-256: 53564dd0615d2e7034e2c65fca2e201ab87dbe7ca7acf864e73c99bd6ea5a8ae

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