Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d7558ffbe026ce…

MALICIOUS

PDF

95.8 KB Created: 2021-09-11 16:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bf401a5df76b74553ecc3cfa4bb31da SHA-1: 4329d155c5224517a321388ea5852a4e2ed43f8f SHA-256: 19d7558ffbe026cea84830d0456224fe7d499815c24bedef2bcc2c555bc27364
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=get+200+followers+on+instagram+free PDF link annotation
    • https://satybharat.com/ci/userfiles/files/64199929059.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/pamopajilul.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/divetiporowegatopum.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/81565656398.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/2656265444.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaedcdc6fb---fimeta.pdfIn PDF document text
    • http://att-na.com/upload/wuzupawif.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/zujubidinobulugemodekupu.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/84316318828.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/40191115577.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4af13d193278135e709a300ff89c932/97829556836.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/xalutesuvipup.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/mufipasamisimaneso.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/fuzokebololumepivesome.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/39489952162.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/98768931956.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/zifinojexi.pdfIn PDF document text
    • http://koutingchina.com/upload/files/54847908037.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/65711740135.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bapugepofuvebifek.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/33084120958.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/19953884906.pdfIn PDF document text
    • http://sushi-belovo.ru/files/bolilojekaji.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/zemotitenelatosa.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_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 18764 bytes
SHA-256: cda222dd4cb8406e8459c41f3c6ad69ceea7309e5aebe0bf581db1c969b75d43
font_01_sfnt_off00013fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD1 10924 bytes
SHA-256: 41e947d8e1932c9f204301474eaa824f588cb514ce054be538c5f1621c829a76
font_02_sfnt_off00015950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1