Malicious PDF — malware analysis report

Static analysis result for SHA-256 9651bd1e7f6c0378…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 13:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3e5b058fa55462ec02a83bb7979343c SHA-1: 0be02a9e9360efb9ca0b0209b2102bfac12e4166 SHA-256: 9651bd1e7f6c0378edefd9a02a929981c46cb46ec61d176bb365a8c6fb1cf26a
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download and execute a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs suggest a phishing or malware distribution scheme. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=gta+5+apk+free+download+full+version PDF link annotation
    • http://devison-matras.com/upload/file/xinobusoti.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/34719196963.pdfIn PDF document text
    • https://matrixx.lu/images/70019921547.pdfIn PDF document text
    • http://millecolori.it/images/file/95830425.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dada4682---bisujurufex.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/bivabakovurorogovikagu.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/zuvidasetanozedinowawu.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/xisafok.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/2347695015.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/91626014026.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/xagomujumozomipedifen.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nixutan.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/gosegapeguxinolojilunuw.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/wonutejefuwugite.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/84363890102.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/tarapitawefixuso.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/zevapepo.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/newowanusafugo.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/sotaxekodadi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tusakalisaxufeledu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144b81a6bbb1---71288337779.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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 18808 bytes
SHA-256: 30a5b0c606f9eaab6c597a1e0c50ac234d5107f33c622c5b4b7fc21abeebf4ab
font_02_sfnt_off00013273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 11008 bytes
SHA-256: c614f6ef5dbdf4362d6aaceef0f19d1d7b8cc5e38e56058e0f52a3bb8a2fdd83

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