Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ad2921bc272cdc…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 21:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc426edc85b36134175cb7453a44e325 SHA-1: 46167c17f64d53813519462436589df6bd924508 SHA-256: 01ad2921bc272cdcf44e9ba1e892cba52fbd68ecf40536e333a1fad6d581195d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The primary lure appears to be disguised as an Android download, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=f+droid+android+download PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9090ce1354342445bc303db92ed850f6/38685450524.pdfIn PDF document text
    • http://shopabrang.com/images/files/tekemilililajupabafurax.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/kezelibazokod.pdfIn PDF document text
    • http://erpos.sk/data/files/86644984980.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/16297979988.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/39913622462.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/varevefezimu.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/71611027207.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/52802669785.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/48038303794.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136568ac1b29---37987710598.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/zibazulapelewasuxegedaz.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/kukirefijugagine.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/13967617515.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/jasamelowakorepopimus.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/71039407663.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jirima.pdfIn PDF document text
    • https://airbays.com/userfiles/file/givakuzunafowiguva.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/45357569829.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/6064115492.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gubemasonuzusesopa.pdfIn PDF document text
    • https://visualarchive.bg/files/71760114087.pdfIn PDF document text
    • http://nincity.de/inline/file/makuzarol.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/nimazadidukijozowof.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/jerimegikamopilez.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_off0000b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C8 16452 bytes
SHA-256: c3da210566511cfe9b70739e7183248e294b6cd1e1f034cd9ac6b6bee6bdf092
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 9904 bytes
SHA-256: bd8f8046f655678fb957116ac19e3c7ec3139b0dbef60d21f7dcebd7be930ef3
font_02_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1