Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb208cb2a4326f6…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 08:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9f0d12302a08577a0783e005ab6ac63 SHA-1: 284144ad573989f1a75d71d50265b90a553832eb SHA-256: 8cb208cb2a4326f68ff2cfdc11794069eb2499c0bcbbc7d64c4c686aa33bce4d
134 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 embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, one of which is a known benign feedproxy URL, but others are unknown and potentially malicious, suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ropesadventure.com/d/files/taran.pdf In PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarep.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/83971784454.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/wifafupiza.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/fokopatudituzubutatojunu.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/98444937497.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/41823611880.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/4763762545.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/1275032382.pdfIn PDF document text
    • https://flomogroup.com/upload/files/tekoviguj.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/2552895301.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53040034258.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/63666476859.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/74713333785.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/sitidugevi.pdfIn PDF document text
    • https://trexanh.net/upload/files/zuxoteguditopu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb6a21af7---29988422758.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/duzerupapimaf.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/febujujul.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/7712191090.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/93977892147.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexazupuvosi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f8456c3f---tafasakewakepekutesulagu.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/20104455534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wonder+woman+1984+full+movie+in+teluguPDF link annotation
    • 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_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 19116 bytes
SHA-256: 0370a884864bc45c6990ce033afc45147e955d921ba2722a85161c436ca9d76f
font_01_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 11280 bytes
SHA-256: 51ea63d00e91fbfdf0f1860720d82ec329b96456c130534b36656a313703e43c