Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cb1979783e08b3…

MALICIOUS

PDF

78.1 KB Created: 2021-03-12 21:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a660d6479c3569a7aced83a34229e1af SHA-1: 26a493adf4dcd4fb98bf13067958f0decb6e8035 SHA-256: 85cb1979783e08b33b93ae1811e9ebecb529f6b8feb7284f42fdca25a1ece91f
96 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, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to 'biosynthesis of proteins'. No scripts were extracted, but the presence of external URIs and the malicious classification strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=biosynthesis+of+proteins+pdf
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/luxujidetebab-fifafaziwin.pdf
    • http://portkamesto.site/578429885392xms4.pdf
    • http://update-win20.online/bumipawurotofofikanowu1u4k1.pdf
    • http://lolabarafusiru.iblogger.org/pudusedowi.pdf
    • https://cdn.sqhk.co/bubiwalifeda/hdEgcgi/dusife.pdf
    • http://prodive.su/how_do_you_use_igora_vibrance_0_008jziq.pdf
    • https://cdn.sqhk.co/suxujaba/jbhejbX/top_worship_songs_2020_youtube.pdf
    • http://uscovidcharts.com/how_to_write_about_reading_a_book_title_in_an_essay44703.pdf
    • http://chategratis.online/zukalomasafazemi1775q.pdf
    • https://cdn.sqhk.co/niririga/jcijpje/50171759627.pdf
    • http://powerhdniy.space/xiwasurnig6n.pdf
    • https://cdn.sqhk.co/pigalixow/Michcje/soccer_striker_king_mod_apk.pdf
    • https://fixexetakofipu.weebly.com/uploads/1/3/3/9/133997797/918525.pdf
    • http://choosemadam.site/31357608879pumku.pdf
    • http://myluckybet.xyz/bapujulaark5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dukifubu.epizy.com/what_is_the_best_5_day_workout_split.pdf
    • http://zipituvopedisi.rf.gd/17_day_diet_recipes_cycle_1_snacks.pdf
    • http://suwinateno.epizy.com/bovusasusosobuvadog.pdf
    • http://junulobexatini.rf.gd/what_is_the_concept_of_knowledge_creation.pdf
    • http://noberow.epizy.com/vitisimitarefa.pdf
    • http://mapesag.epizy.com/autocad_2020_3d_polyline_to_2d.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_off0000e98c.bin
adac19df8b46cb768f070a2822adde7cc59ea35bd6d8e445db1f04be3ff83941
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 4824 bytes
font_01_sfnt_off0000f9f4.bin
5bf0bbce412b9d09ddcce54bb0cab5350e5aa3576bc9daaca70fdc2823fd036f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10240 bytes
font_02_sfnt_off00011d02.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 4324 bytes