Malicious PDF — malware analysis report

Static analysis result for SHA-256 6476d2fe8f917013…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 15:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b447ef9449a6dbe33469f02699ced4b1 SHA-1: a4cf666789cd06491c4b4575de7358c2cf576489 SHA-256: 6476d2fe8f917013c7c328d495dc47e2bbb4cae99b66fabf06b0b474946d4ca5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to 'infrive.ru' and another to a link farm heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=super+city+mod+apk+download
    • http://cncforginghammer.com/d/files/60970048847.pdf
    • https://fiscconsulting.com/userfiles/file/tunuwukajokevasanebifanum.pdf
    • http://hamkr.com/userData/board/file/vewosebidizonijabosugabu.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6mbfcjhc31vonq53s6ophvj7gj/gopokaxinuvepavaduzowo.pdf
    • http://soluzionebenessere.eu/userfiles/files/71542688029.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/88376781792.pdf
    • http://alpinedelhi.com/userfiles/files/raxufokovumaxa.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a71ih931a0o98ug9rs1hhsk5e5/8275823053.pdf
    • https://verredistri.fr/xmedia/file/9894620319.pdf
    • https://rockyhotelsgroup.com/uploaded/files/16423494545.pdf
    • http://marikitaberbagi.com/userfiles/file/88906579540.pdf
    • http://uhorder.com/upload/files/piwudaxotaluxalu.pdf
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/peladapavefepegaba.pdf
    • http://augustaelectricalwork.com/editorData/file/xudobunefiv.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/72914174122.pdf
    • http://gdgom.com/upload/file/210904061732611975aonzboi9wf7r.pdf
    • https://artistaone.co/userfiles/files/88853496736.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/siduxovepipederanuli.pdf
    • http://vitanova-cattery.com/upload/file/gozuke.pdf
    • http://swissies.lt/ckfinder/userfiles/files/26802676760.pdf
    • https://afritransport.com/app/webroot/files/file/zarofovolixagirenu.pdf
    • http://stolizstekla.ru/userfiles/file/59721563854.pdf
    • http://videofilm-tv.ru/content/File/fojebisamazumometil.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://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_off0000ed6f.bin
7c6526ca2f988213b3fc0c35f1b65b8edcdaa46b7babdf10b5cce0df69666f44
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10972 bytes
font_01_sfnt_off000106f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 16792 bytes
font_02_sfnt_off00011f0a.bin
8358ffb25cc2e3c4132e768f627191c33260b6f546e7390aa236f089375e345b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 19132 bytes