Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e56f76bfde2a5d…

MALICIOUS

PDF

86.0 KB Created: 2021-10-05 08:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76d0a75d24ef024e9690b6e8f5a4c4f5 SHA-1: 5a3dc8a12670d227381b924524269fcedaf5c679 SHA-256: d3e56f76bfde2a5d14ee96c8d116a98537b16edf5092790a2fc27172473925fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://theptaynam.vn/upload/files/92830099654.pdf In PDF document text
    • http://akvari-um.ru/userfiles/file/8550680095.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/8410574841.pdfIn PDF document text
    • http://zaiger.ru/img/file/36369285708.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/wefonusini.pdfIn PDF document text
    • http://tfforming.ru/d/files/mulizowitudaxi.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/71265048765.pdfIn PDF document text
    • https://renewone.de/files/rutezu.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/pegezazidofum.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/motusajof.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/zurixikulozoliju.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/gosatujolowokokezuj.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/ziderabomabipagez.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/gakivekiw.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3efe6ac8c92eb5013a546479a1a81a3c/22252941916.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/2435565760.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614418dc1b216---wokuzovago.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/divegisofubonugubibudi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xerurideli.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/74602603795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=begonias+and+sunPDF 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_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 19480 bytes
SHA-256: bf8facd4fbad4c7937e9336f02730ad44aec50413012205f33d41ccc383ab534
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13370 10332 bytes
SHA-256: c4d900f1e22c73106168f3e533d6138a74fd33cdaee83a24a0fac83e4c8f8430

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