Malicious PDF — malware analysis report

Static analysis result for SHA-256 0797cb64f09b18f4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 00:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44671532eb26e51b3c3d6a2a66ed5c86 SHA-1: 333d24a0a502fa149a7bcba1604d2b7fde19630e SHA-256: 0797cb64f09b18f495838410659680e90b5ec0aae449c4ae8b65cfd655df4d30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://laborke.ru/uplcv?utm_term=how+have+free+robux PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613995a838124---suneg.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148be9f6a3c3---91848612835.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/guzukumevej.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zusesu.pdfIn PDF document text
    • http://lgassociates.in/uploads/lemuwerigezodinoxabolole.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/zogulanunapomag.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/20400545650.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/pezokajog.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/nutadugokuwolejolugoxi.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/29508986317.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109050357569014.pdfIn PDF document text
    • https://raljob.com/userfiles/file/dowobibumifuguvu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bazezirafulodamim.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/tedolatonogo.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/29653513542.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903013208.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/79656912082.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/23483533963.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/samaxodabita.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/vigivakutepokulinobilel.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/tatozu.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_off0000b19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19C 10288 bytes
SHA-256: 508375c358f9d69de1e42461065c7d21b30dff08d047ee46743946027454f454
font_01_sfnt_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 17300 bytes
SHA-256: 166c9fc7d403a5552e90cb3d3eed8ea5d9c140fd77e26284c1eb42be26c9c9a5

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