Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fc76c92c43fa16…

MALICIOUS

PDF

78.5 KB Created: 2021-10-07 23:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3e5d82f902f29e67f49a5e150eb3fb4 SHA-1: e2d88652b570237a9ca2707c50c5873f5c329e0a SHA-256: e1fc76c92c43fa16ac16041f056fc84a0c2ded8d389e063b6b6fb49466b99115
134 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate it's a link farm on disposable hosting and has been flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded JavaScript likely directs the user to one of the numerous external URLs found in the document, potentially for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=vowels+and+consonants+in+marathi PDF link annotation
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/lorafem.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/mirukudituravetedafana.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/85225318639.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/57467211904.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909202548360329.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/vawemejusesa.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/19328554414.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9e108804---15106888487.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/29502719498.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/tumeginijerozafotatova.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/2711914861.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/31906697910.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/87004296527.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/47973005515.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192675338534.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/34410318491.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/61140265940.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/70771202921.pdfIn PDF document text
    • http://gr-chem.com/upload/files/veweloful.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/31919627596.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/luziruzovekukifoveb.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/398357602.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/87781085633.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/xazegojegalevojo.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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10688 bytes
SHA-256: 3f3cedf6508635655b4cffe449f7f441ddb3985b463a45ca23ca96ec02b1191d
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 19844 bytes
SHA-256: 186a256914b2caecac337a4980e74fa87e39ee7848d00765528a44375869c7f5