Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d62f6ba0b9f02ba…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e31402b6e4bdbae3cfd8505ce269975 SHA-1: 6f9ba076de18728be13a014538b8b6c1a11cb6d0 SHA-256: 1d62f6ba0b9f02baaf9b7a6dbca8257afdefbb3b5bf53041cd53d2a4ed347c4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or initiating malicious actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://isleo.com/i_photos/file/58444546562.pdf In PDF document text
    • http://dspec-car.com/js/upload/files/gamunokozaxu.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210918111717214563xgljr.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901132127.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zejimot.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/60368748520.pdfIn PDF document text
    • https://leeleather.net/userfiles/file/jukenerexifobamaziz.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/1870004710.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gutakazub.pdfIn PDF document text
    • http://sro52.ru/uploads/files/13001832773.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9654fc8656b5f232ce56b4ac0ab1cf34/7096869796.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gedenezufa.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/82373353503.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/5387185462.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/945798241.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/rovugirajomoben.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/5331609769.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/36393373662.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/neminej.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/rezoruxidujoresizor.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/58808459653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=text+to+binary+online+converterPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306373949080.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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 15924 bytes
SHA-256: 7ceed03973cba6d81208e94741ad6015ed3db61c101bf3cf98d848e5e5a4069a
font_02_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10440 bytes
SHA-256: edcd106037ddd643d11961d12632cb3a2c5cb409e48946e1d9bac647708c31df