Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b95292a97809e30…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 13:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68ea5473387e837d7971e76777db9a58 SHA-1: 0f25e2f0e8889ab50815a940dd047b923d5f3cf4 SHA-256: 5b95292a97809e30478ddeb93f7cd3fc5114f966b7d084f39a28be2f3ff1ac2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, including one that appears to be a redirector for a firmware update lure. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=m8s+android+tv+box+firmware+update
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/96906018439.pdf
    • http://vector-food.pl/userfiles/file/30562535524.pdf
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdf
    • http://kozhencherrymtc.org/userfiles/file/35374003728.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/63748522268.pdf
    • http://hoanggiaphatland.com/uploads/image/files/meworubelarizafuzebux.pdf
    • http://problemconsulting.com/img/download/files/18301211399.pdf
    • https://drinkpoint.com/uploads/files/47194928227.pdf
    • https://evergreencans.com/userfiles/file/tunevinegusejupegaj.pdf
    • http://vuonlan.vn/data/upload/files/15238423795.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/41692533522.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/95411342592.pdf
    • http://savitaco.com/uploads/images/files/vuvorezudotiwi.pdf
    • http://zgic.ru/!upload/files/zigutusadubin.pdf
    • https://ceccarmehedinti.ro/userfiles/file/15935808926.pdf
    • https://seltec.io/images/uploads/files/jonobaropujatov.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/51628214201.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/zatijofeluwif.pdf
    • http://ombs.ru/uploads/files/58738177857.pdf
    • http://jsqnchem.com/upload/files/70474860843.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/fiwaja.pdf
    • http://tythb.cn/uploadfile/files/8186026852.pdf
    • http://eksternest.be/images/file/jagifokorokalaz.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_off0000b1a9.bin
e0b16d1a9641edf47d9980c38ed3b11bd50be08fc92c6d83441bd86baf5240c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 15764 bytes
font_01_sfnt_off0000d9fb.bin
b11b843f3d1c2c12a14c329efbdba392f5faca79fc6b3b0260d0fbf675414ce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 11308 bytes
font_02_sfnt_off0000f479.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16792 bytes

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