Malicious PDF — malware analysis report

Static analysis result for SHA-256 69be58a590679d6c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 00:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04b4528a955be7ededa2e88b0e367a8f SHA-1: cc0b3be49760f776a8fb70d7875d526a025ed0bb SHA-256: 69be58a590679d6c5cf82db034142cd4fd8bb210aa1b7fbd5473758829f84c1c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=program+rfid+tag+android
    • https://villatoscana-pi.it/userfiles/file/kefaputako.pdf
    • https://dutchhaves.com/uploads/files/202109210018289130.pdf
    • https://globalcircle.club/userfiles/file/pimol.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/49792053551.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/bigulinej.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/vubuvib.pdf
    • http://bonezi.morefriendship.com/upload/files/40271844120.pdf
    • http://thuonghieutoancau.vn/uploads/files/favodadabiwivujuge.pdf
    • http://zjgjqmr.com/v15/Upload/file/202192552313082.pdf
    • http://narcisse.sk/editor_uploads/files/31481373282.pdf
    • http://szzxwx.com/Upload/Upload/file/2021916927515021.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/19879173745.pdf
    • http://livelyway.com/ckfinder/userfiles/files/42936554458.pdf
    • https://sabunwangi.com/contents/files/vimilubabob.pdf
    • http://ferrocom-spb.ru/userfiles/files/lukodopezasazevubonexitu.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f2ab60255ecf60f79e86a59297c42652/zugukivavetidifima.pdf
    • http://ieltsadd.ir/cache/fck_files/file/kebegekejamibitiwazixigij.pdf
    • http://reichspfarrer.sk/file/noxokamudimo.pdf
    • http://phone-server.com/userfiles/file/zubuvug.pdf
    • https://defrokatilai.lt/images/files/33469401638.pdf
    • http://viviapalermo.com/userfiles/files/63461376100.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/99953080021.pdf
    • http://alconsprom.ru/ckfinder/userfiles/files/vigewubusanelituwa.pdf
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/nunakegilowe.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_off0000b46d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 16792 bytes
font_01_sfnt_off0000cc84.bin
8cb1d4dc59c1806ecf82d8c40cd54f2b06272c0c8140e90b21d83cf2b38e7095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 10352 bytes
font_02_sfnt_off0000e39a.bin
10b08d79a327e7fa21266311e7857187cebf12dcf83c23870a7423e4b5540437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 17332 bytes

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