Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e267e1eea901db7…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 02:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08bd63167341574ef6fdfe97a43da51a SHA-1: b141566d1cdec455f4795da328a2e9f77e485a0a SHA-256: 7e267e1eea901db760423f49740d39e0b60a8f766d44116d2c824aea583c424c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially compromised or disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=robbery+bob+2+hack+game+download PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144937cc910a---20390745960.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nulidusoxar.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bukepunowo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1e3cdac3---bugepuse.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/palolipefekafikuxiboxep.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/91435814556.pdfIn PDF document text
    • http://espokebar.com/uploads/files/dojekov.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/giliwokored.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wugumezegaxemez.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/83086251928.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mivogupivo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/90745510880.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/tirivubulumogovesire.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/bolonokunebaminulu.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/50978031154.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rexofafowib.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nodowepiriximatukivemeke.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/livexidonimujugoxalexu.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/10514861943.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bemebivuvapasoxejuz.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/75751339335.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kotovekaxelibudijodel.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/19519967518.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_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 16640 bytes
SHA-256: b3ac76df468f6e03d7fedf7ca24a6b246d829f9ef8c07fe274ae7b8192bf5f3a
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 11056 bytes
SHA-256: 471b5c9eebf845f8f86362afcfbc30c89d119478874e528804bc1191f9dbe434

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