Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f98163ad4331ac6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44b14be0f01f42abe8c045a40d4b845d SHA-1: 66ea24c0b35773d602ea357b211539cc2cb38f42 SHA-256: 8f98163ad4331ac6dc478358ff9aa9ed3c27a2b3a2cdd67ce40cb4fc675e3d1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URIs, many of which point to disposable hosting and are likely used to host further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=m%26m+clash+of+heroes+apk PDF link annotation
    • http://filippodelvita.com/demo/userfiles/file/dezipiwosujoremukurato.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/fejezafubikozek.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109010832457033.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/lapuwobesovaxagepolomur.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/64400135993.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/popedemabuxaru.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137da487aca8---xolubidi.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/tekedubogewifopelopidu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lilaxibefuve.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137d14a48e8f---xexij.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/40336268497.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/fiperukujifazajifuwe.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/zaxonimexinibigiwog.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/vinenijin.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/96184070.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131d50a54b91---sowisilewesinubowapoxu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/39554094699.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/15355216521.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/gowexomutosovevaded.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041949444287.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/runulegekovix.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/21656669569.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/72665947162.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/lokaxewavexanifuv.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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 15524 bytes
SHA-256: 73e0185d1ec5c5dcf88d3a3dc89f3273d54e33f7017ac2326833fc075ebed50d
font_02_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 9068 bytes
SHA-256: 0c5dc90c3de47cffa0504e1bb228b014d25b31b00ac4265d3cd1e9712d82adbe