Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2aefdc4fbb6db71…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 03:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b438bef84f949d6b7d60a8147fc5e238 SHA-1: 578db2bca12c2c3ebb73aab467f3779b66587ba5 SHA-256: b2aefdc4fbb6db71a237a622063d01e2910c85761a830591d40dedadf06efd84
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous links point towards a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=lesson+of+passion+android
    • http://abworder.com/uploads/files/13542835061.pdf
    • http://henanshuangxin.com/d/files/36520408732.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/39763324460.pdf
    • https://classconnbio.com/img-jacson/files/45035110104.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/roxavivitipubo.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/81273082001.pdf
    • http://flairpens.ru/uploads/files/242098072.pdf
    • https://eminencesolutions.in/resources/userfiles/file/kawapu.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/44014283056.pdf
    • http://weorderfood.com/uploads/files/36606948951.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139673403951---40299641420.pdf
    • http://pileshoppen.dk/userfiles/file/pojikad.pdf
    • https://sesconbs.org.br/ckfinder/userfiles/files/lazivalakuw.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/vuximejava.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/20900972436.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614383565f627---92062247809.pdf
    • http://coca-colalife.eu/userfiles/file/87581807251.pdf
    • http://wingmanplanningdemo.com/userfiles/files/kowexironemozemabajod.pdf
    • https://rajatotogroup4.com/contents/files/ditaponizivotavebunabid.pdf
    • https://sergiomauri.com/images/file/jilaruruzerixufapibebol.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/sixozexal.pdf
    • http://a-xian-coat.com/uploads/files/202109092111435102.pdf
    • https://stancijanegrin.com/userfiles/file/woxokusegosekibomobow.pdf
    • http://kammed.com/userfiles/file/xapoka.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/54532510752.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_off0000b057.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 16792 bytes
font_01_sfnt_off0000c869.bin
e0430b9fe1c86683bcc03ffee4e55c5463ea4c9c8ec7f3b1de2bbf7e4e39be2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 16328 bytes
font_02_sfnt_off0000f1ec.bin
57652a395e704bf989477b5349955e99f45427c20fd299ed4671f3b2de0aeb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10304 bytes

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