Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0b117a84213061…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 10:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 175997354fb5dbd8a878b94cad31c237 SHA-1: 0c63f6923d25b7dcfde9ce55f996b9971ff27a4d SHA-256: 8d0b117a842130616bfc36155b0a4fe548a5d19ab844b9c96ac522c6b972c36d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=repeat+text+notifications+android PDF link annotation
    • http://misr-consult.com/userfiles/file/rugurazasejozekave.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/nilodilalabinesud.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/26781467469.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/kogululipiwasikidawebefoz.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210923_CCB813AB5DC38D1E.pdfIn PDF document text
    • http://remobudostol.pl/pliki/51449370061.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/7594300235.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/gumoso.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/xewarowoxofonogujigug.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/35352476206.pdfIn PDF document text
    • http://makaroma.fr/upload/file/wumopagisuribexiruluw.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kmfmau7qhgm5c7tudpseci2efm/79305940569.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/garaminixikurififafep.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/88691984873.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/vobewunajafisu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/kotidelulinoriwavevedimot.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gigopatejitagi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/dexajewinafisenelidabeg.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1af61df8b---rurezigofubenigo.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/bakimuvedoxawewetuzo.pdfIn PDF document text
    • http://nut-shell.net/upload/files/2729962777.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/zusufiwapi.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/84586986521.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/towurekulexoresinefaj.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/2459952085.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB456 10716 bytes
SHA-256: 1c8a768ec0718bb244129e05d8f46458e24c4e155d489337e1afc3785e7bb0e9
font_01_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 16820 bytes
SHA-256: a3805bcfc3938ffbe44212dbea25154bb1c8f7dd51cd1b7d0b776c04552c89bf
font_02_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1