Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54b3b1e928ce22a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 17:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23e321f22b9a3dad9fbdb539626b2f3d SHA-1: 5627110aac2b75cbd654e3b8d0ff6a41a7a0c9b1 SHA-256: d54b3b1e928ce22aa6deb77c4b006f5c5b6b1f8fdac633546cb2bc793ba00f28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://drafthe.ru/uplcv?utm_term=watch+boruto+197 PDF link annotation
    • http://wronba.com/uploads/wysiwyg/file/12611534617.pdfIn PDF document text
    • http://lawngo.net/fckfiles/pumowewikafen.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/31152891390.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/28230715897.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/wafubirurogogawad.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/83599636212.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210908_BCF0824CB79D0550.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/lezivodiwibirotoropikede.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/4360246643.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/mutixofulev.pdfIn PDF document text
    • http://gibisch.biz/files/files/48928402552.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/kakugo.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pewekurexopakamab.pdfIn PDF document text
    • http://krzeptowski.pl/file/70745254319.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/86920029115.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/zufigozevizifutifole.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307e7f7531c---bejavujapujoxeb.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210904_7646C6E268EA9351.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/lapavagatopatufigigoja.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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10288 bytes
SHA-256: 4fc0c474036e1b2872135959454126066d1af64da819f62dd483e99b3f10ae92
font_01_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 17004 bytes
SHA-256: 8152d371db9d234525436d097d55261ccd7a96469cf6b34b86d783b17c5b485e

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