Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c67fbc590ba984a…

MALICIOUS

PDF

75.3 KB Created: 2021-02-15 05:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ddc443915d276ffb3d1d1c5d1ba5e6b4 SHA-1: d92ea19f3d5b2a8b63005fbfb9ed8a22a5244e14 SHA-256: 4c67fbc590ba984ab1fe4fd424982609add047946700bc5b7afa2ab676d33715
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URIs, including one pointing to 'jottigo.ru', and is structured as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to a transmission manual, likely serving as a pretext to mask the malicious intent.

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/aws?utm_term=borg+warner+sr4+manual+transmission PDF link annotation
    • http://gakivako.iblogger.org/49683095664.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/jeWmgdM/pop_music_artists_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/JUjMjdH/beat_the_boss_4_hack_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/iWiiwy1/micro_battles_2_unlocked_apk.pdfIn PDF document text
    • http://edapog.online/51726979269w0bpd.pdfIn PDF document text
    • http://fridgeservice.ru/biceps_clicker_ofglapkn.pdfIn PDF document text
    • http://websporizle3.com/ambasamuthiram_ambani_moviesx6g4i.pdfIn PDF document text
    • https://cdn.sqhk.co/badiwugaleko/ahdhfzc/guitar_ringtone_malayalam_movie_song_neela_ponmane.pdfIn PDF document text
    • http://stavki-na-sport.site/eternal_sunshine_of_the_spotless_mind_poem57zt0.pdfIn PDF document text
    • http://nyvelsets.online/descargar_doodly_fullqf5kv.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jiMiijg/cheat_legend_of_ninja_dragon_fighter_mod_apk.pdfIn PDF document text
    • http://fabermanufacture.ru/taxafavekikajarawa37epi.pdfIn PDF document text
    • http://xeeewq.xyz/download_cerpen_cintaze5ti.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/gchhTjh/sudokoxerax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikikifuxax.epizy.com/diamond_aircraft_maintenance_manual.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5236 bytes
SHA-256: d3b682e5596e5ec0a0de5c7b8df715f6f789299dbb36dd3e3a1cfbfaae9cc83a
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10456 bytes
SHA-256: 0f1bfbd7edc9633bb65aabbbeb1591080a47eaabc417e0e5a943f9799dcc5795

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