Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad875c4ebe6a1b92…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 03:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c92e0e36a924f61c386eba565fb7abd4 SHA-1: 1218d26a6879b2449b78319ca196641d26f5dfd0 SHA-256: ad875c4ebe6a1b92098edb35f9de178b527f432994a0bd1e25e44031adf34898
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a high ML score and ClamAV detection indicating malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to one of the listed URLs for phishing or further payload delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cribpointonline.org/cribpointonline/userimages/file/detelegeluvax.pdf In PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/kufubufobokeviran.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/3772433427.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/76607327207.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jupudabafus.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/ximegov.pdfIn PDF document text
    • http://citty.org/images/uploads/file/tetibowadetomejananuv.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/59969109860.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/67278960649.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/tipumugewekisoxid.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/92774892785.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/57870700514.pdfIn PDF document text
    • http://tchid.net/userfiles/file/45879758510.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c18f5e3---lodixikafotoxoxajupirur.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zidopuzavesuvefezolesula.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/95510163933.pdfIn PDF document text
    • https://proxus.nl/file/69713443938.pdfIn PDF document text
    • http://abwva.com/uploads/files/27384457077.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/69768109842.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368709a162b---regekikunugofoxebe.pdfIn PDF document text
    • https://thietbigas.net/media/files/40840768893.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/56049473457.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/53334587412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=boxing+free+live+stream+apkPDF 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 17476 bytes
SHA-256: 0d292158a8ddd13f3f555c0816ff1322a553538d4b4cf84f6007947ad220e2cf
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 11012 bytes
SHA-256: 2772e7fb5edcff66acad9f64f74fd6a59b9e4bdc6ae25943b361691bc4d40ac7