Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b75ada100f17a2…

MALICIOUS

PDF

83.4 KB Created: 2021-02-12 23:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 60e06026b989638daee07974b5399dac SHA-1: e571ae0e7249f849c3609008231072672c0cab67 SHA-256: d6b75ada100f17a2401a7e3bb6bfa785a6738d70c0212d2d1dd1970ea4bb4dfc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains obfuscated text and numerous embedded URLs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, 'https://jacksth.ru/123?utm_term=wet+and+cold+skyrim+mod', is likely used to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=wet+and+cold+skyrim+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377403/normal_601b43755bd3b.pdfIn PDF document text
    • http://studytogether.fun/hd_movies_website_quoraq4qe5.pdfIn PDF document text
    • http://vipmanmarket.space/41596085056qyl37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5fd27af21904a.pdfIn PDF document text
    • http://monongzhlh.space/fiweww0eof.pdfIn PDF document text
    • http://zuluwana.iblogger.org/42424589455.pdfIn PDF document text
    • http://tefosewun.22web.org/171647624.pdfIn PDF document text
    • http://goods-amzon.com/50437294073b7ano.pdfIn PDF document text
    • http://kefojixesopu.66ghz.com/gleichungen_mit_binomischen_formeln_bungen_mit_lsungen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_601f0e2b7d739.pdfIn PDF document text
    • http://www.gamesas.com/topic/1426518-rel-wet-and-cold/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigexeleza.rf.gd/12778137795.pdfIn PDF document text
    • http://pimuxexud.epizy.com/sokuduwasuxefe.pdfIn PDF document text
    • http://nagikesedogoru.rf.gd/employee_exit_interview_template_word.pdfIn PDF document text
    • http://kurujabarufuxe.rf.gd/ws_ftp_windows_10.pdfIn PDF document text
    • http://komujawabajufob.rf.gd/cartoon_dog_images_free.pdfIn PDF document text
    • http://static.skyrim.nexusmods.com/mods/imageIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 5264 bytes
SHA-256: 9ee2a5fac4a2f85604ba80506b436a1f1867ae2320b3bd6af572e19575efbb05
font_01_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 11188 bytes
SHA-256: dfbed8dd4e1d63fa5a23f90d6c0df4bf30e0953bca86ac9e5778d81d322af8e2

Open this report in the interactive analyzer, or submit your own file for analysis.