Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf19860905d6a5c…

MALICIOUS

PDF

80.5 KB Created: 2021-04-23 22:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae7ca6fd4ec1358f512c4e95a8503e0 SHA-1: 4ee990e1df05eb9840779a11cd872071e4c8ae24 SHA-256: 6bf19860905d6a5c0b747ec39661d0a5933d62d0c3c566f3c13d88b21bea175b
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to quadratic equations, likely intended to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=que+tipo+de+ecuaciones+cuadraticas+hay
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/4548836.pdf
    • http://dawajilimomod.iblogger.org/do_reloading_primers_go_bad.pdf
    • http://fanitukasi.22web.org/82772796962.pdf
    • http://xuzekamusudis.iblogger.org/appium_webdriverio_android.pdf
    • https://xilinupuvawede.weebly.com/uploads/1/3/5/3/135350476/63b306.pdf
    • https://cdn.sqhk.co/nefakovuwot/jcjtljj/wixunasuwufisejugetudo.pdf
    • https://witojezig.weebly.com/uploads/1/3/0/7/130776148/6241533.pdf
    • https://cdn.sqhk.co/masamiwe/gcibgdX/best_music_player_app_for_android_free_download.pdf
    • https://pibitodasako.weebly.com/uploads/1/3/0/9/130969140/merota.pdf
    • http://wisiwonalanuvir.iblogger.org/befejaxasagumanakefik.pdf
    • http://xowivek.iblogger.org/boboiboy_galaxy_full_song.pdf
    • https://cdn.sqhk.co/dofofoziga/4Zj99Cz/rasafumexumikujipu.pdf
    • https://cdn.sqhk.co/kibukumivu/TierTa9/jexiboxola.pdf
    • http://ruvejufagofo.22web.org/83878782533.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/wuturasuvag-savuzikaref-jogutari.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vejikavufabaj.epizy.com/17886940005.pdf
    • http://jewixijanag.rf.gd/nujuxixuwiwitibufod.pdf
    • http://rotuvuduvixamek.epizy.com/tekoridexufisesibikenaxup.pdf
    • https://uploads.strikinglycdn.com/files/0d73bb5d-7c80-4480-bd41-15063b71a6bc/65244465642.pdf
    • http://bajamixowi.epizy.com/let_the_drums_speak_bernard_purdie.pdf
    • https://uploads.strikinglycdn.com/files/78316a52-eeef-4ebc-9538-99521d825d08/how_to_make_crown_royal_peach_cobbler.pdf
    • http://tabavujafus.epizy.com/dibujewapob.pdf
    • http://melovawofijubab.epizy.com/25897002658.pdf
    • http://kogisovaf.epizy.com/company_short_tax_return_form_ct600.pdf
    • https://uploads.strikinglycdn.com/files/d4283dde-da3f-4154-a698-fc064aed7cc2/is_star_wars_episode_9_canon.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_off0000f8f3.bin
586d898e2616db12157f5459ef22eff3f25b13a7e3dc6a36df7e3b7aa611be0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 5292 bytes
font_01_sfnt_off00010af1.bin
d7c2c208fb6ccaeb933ab87f501bc10cf1342aca44a751a905d0e48bbb08d0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 12392 bytes

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