Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a7f7eb296951a8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 16:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3edc7994a7c4c9ec0dd0faf9a796b1b6 SHA-1: 64f69f73f23f4f87a7146669225f0dced2075042 SHA-256: 19a7f7eb296951a8f29cddfce1220c78eb82d032efd7a2ac190a72dae7ac957c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+to+save+tiktok+video+without+watermark+android PDF link annotation
    • https://familienbilstrup.dk/ckfinder/userfiles/files/tuxenomesoxipibafoneti.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/gezatojurugabozoxufifa.pdfIn PDF document text
    • http://blueyee.com/upload/file/160213036903.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/18212653401.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/31415742215.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/67226184004.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/nareze.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/37328674947.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/pogogumarixuwurekupo.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/68365528312.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/xudowadexodumad.pdfIn PDF document text
    • http://specialcats.nl/media/files/rudefegumiweromago.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lowatesadetanewiwutonidol.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/zamumenubaji.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/ritisorotudedokolipogewup.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/15902252919.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/34530126993.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/kimiserofesotoruvanu.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/wukilapiwamopan.pdfIn PDF document text
    • https://ienter.bg/files/24155875637.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/fegejagiretonebifuresuzut.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/56834867004.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75500225781.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/11965415371.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10804 bytes
SHA-256: dfd550dac60b2dfd6a51755f2b5b69a8741082e0e7a94756fd0591a701965743
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 17340 bytes
SHA-256: 6669a17e6814574a91282759290a1fb50a5f46d519b631141cd9217371ec8c05
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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