Malicious PDF — malware analysis report

Static analysis result for SHA-256 1868ae5ccd8b8bb2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 13:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bae2f52444cba249a83f0753dd8bfc36 SHA-1: 8c30beffa6ecd30d841aa18d40e9b6cecb82f096 SHA-256: 1868ae5ccd8b8bb2d617e8bc582fa505e2479b70ace1511bddfea53092e7db04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=optimiser+wifi+android
    • http://heorungminhphat.com/luutru/files/86374368153.pdf
    • http://clear-es.net/yamituki-n/uploads/files/lefiviwizewukejuzasut.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/20446962973.pdf
    • http://oroblupiscine.it/userfiles/files/78340601627.pdf
    • https://curvy.tw/upload/files/tagajojenizomafakalux.pdf
    • https://self-storage.sg/images/uploadedimages/file/jemiditipop.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/32099589548.pdf
    • http://protezas.lt/i/File/3787868015.pdf
    • http://warwick-ems.org/userfiles/file/97856717868.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d9202b3d93f3a744e59e6d1e195f6af4/liredatuweguv.pdf
    • http://pn-tech.net/userData/board/file/buwaribu.pdf
    • http://hvezda-pardubice.cz/files/file/69864144321.pdf
    • http://simoncaulkin.com/images/vovujoz.pdf
    • https://kermanrooz.com/img/files/20658997184.pdf
    • http://otczenacts.com/media/files/93743204668.pdf
    • https://questyme.com/userfiles/file/suwosewowomovudafunob.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423778c8235---zajixewam.pdf
    • https://stcc-sa.com/motakamel/Ups/files/16711688794.pdf
    • http://happyorderfood.com/uploads/files/60261584709.pdf
    • http://sgd42.ru/userfiles/file/raxepugeforowu.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25830419954.pdf
    • http://www.allatpatikapecs.hu/images/file/jisoxizulesesodaruviti.pdf
    • https://majubesar.info/contents/files/pojuniv.pdf
    • http://frigotechreina.com/userfiles/files/63670378184.pdf
    • http://technoauto.jp/js/upload/files/tegejozifuwowuvubaz.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_off0000df54.bin
13c5da075e44fa90bc0cf319ec94edb0422c2e36244c317e614b40db77a86598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10724 bytes
font_01_sfnt_off0000f816.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 16792 bytes
font_02_sfnt_off00011028.bin
7509a5a855673fd822093deed9cfee802e19b1433314fc397c661e4a1ff817a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 19816 bytes

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