Malicious PDF — malware analysis report

Static analysis result for SHA-256 892a6fbb7c1fa2c0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 02:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76422aa85937528d48f0d3f42a40bdd8 SHA-1: a7b996a546d292d7232464599bd747660cd99a8f SHA-256: 892a6fbb7c1fa2c0066d8681abc32989f38c5aa2b0435c6189e1524242cecd27
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nsk-nalogov.net/upload/files/1867598710.pdf
    • http://saigonradio.com/userfiles/file/nosegalami.pdf
    • http://exima.kr/userData/board/file/49458782176.pdf
    • http://latiendasegura.com/contable_prueba/userfiles/file/rigazusisafupufasunisel.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b0c19b91---21533199461.pdf
    • http://flooroverstock.com/admin/userfiles/file/27674795204.pdf
    • http://websteravelandscaping.com/editorData/file/jovoxakenuposakewo.pdf
    • http://prograsifkalip.com/files/xexowojawi.pdf
    • http://grimastone.ru/files/wekifevagojaxobelap.pdf
    • http://wabasnb.com/files/fckeditor/file/14769733896139c16e4f973.pdf
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/29552546627.pdf
    • https://birotex.rs/images/files/xowariraw.pdf
    • http://tcyy88.com/userfiles/file/2021090914331273499.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dad1bf100---36293229040.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/30970094897.pdf
    • http://devison-matras.com/upload/file/faxapufelutuberidufex.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/85295816857.pdf
    • http://asbazainville.org/userfiles/file/2449521687.pdf
    • http://csc-021.com/userfiles/file/20210914002151_ohs274.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/lepobowaderulu.pdf
    • http://suaups.net/userfiles/file/zatifutefif.pdf
    • https://almavilag.hu/files/files/fenovuragogadati.pdf
    • http://iccjsc.com/images/uploads/files/mofozezukex.pdf
    • https://stephankeppel.com/userfiles/file/50310868871.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/99126747723.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=avengers+watch+online
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ab.bin
567679f7490800943f350b166543351beaab825377a963ca9ef5f9dc70888801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 10640 bytes
font_01_sfnt_off0000cd11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 16792 bytes
font_02_sfnt_off0000e523.bin
f78f1c1218312f3dbce6a648395f4e8c1143af7279235823cb5b5df894ebf382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16188 bytes

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