Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2bc406a7f5c742…

MALICIOUS

PDF

83.6 KB Created: 2021-10-11 22:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0164a57f7950fc6c1fc09f55916f870 SHA-1: b98062484994a885d703f0b4fd6bebeeac1c41dd SHA-256: 5f2bc406a7f5c742ad73a9b06d43f0daa8cb8603938691dfd0f50872815b0ef2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with specific detections for phishing and trojan activity. The heuristics indicate it functions as a link farm, potentially luring users to download further malicious content, and contains language suggestive of an invoice or payment lure. The presence of numerous unknown URLs points to a distribution mechanism for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://hanauhrova.cz/files/tonutafejov.pdf In PDF document text
    • http://studioingegneramato.com/userfiles/files/61331781067.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///vegepajikim.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/xanegexox.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/sogulabawine.pdfIn PDF document text
    • https://proia.bg/userfiles/file/73078943766.pdfIn PDF document text
    • https://teamcode.net/upload/files/77669945105.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lenaxotewoti.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/18801146461.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/50693015595.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/milazip.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16155e9df1d275---ginukipenalulo.pdfIn PDF document text
    • http://datatech-int.com/userfiles/file/midizis.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zajukigugapaxizipamarele.pdfIn PDF document text
    • https://alariel.be/userfiles/file/rolak.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/bafixovupadivifupazuvotov.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/fosavuximu.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/804284347.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/59151940211.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/21243529472.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109060314461398.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/60053666894.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/jesusorusexekez.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/memewof.pdfIn PDF document text
    • http://maulich.vn/attachment/files/86593848032.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=important+design+patterns+in+java+for+interviewPDF link annotation
    • 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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 20372 bytes
SHA-256: ba133103560d344088db212b6e0c23b27bed33b98a3875cb6da0ec4ff6db0073
font_02_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 11028 bytes
SHA-256: 8969f5bc598986909c0720dbb92c0ce964e864572fd0a995306b0c6f07436790