Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56c43a83c346b37…

MALICIOUS

PDF

66.7 KB Created: 2021-02-27 17:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f0906c49a5d82c0015ff482f3c4af81 SHA-1: 57aa85bf25618a22b5ce747ae96bdd2f55dd542e SHA-256: a56c43a83c346b374e2d41c7d574a7ff595d3da4efab0bf9ad249cf92117bb97
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary URL, 'https://druttle.ru/strik?utm_term=what+oil+to+use+in+cub+cadet+xt1', suggests a lure related to a search query. ClamAV and ML classifiers strongly indicate malicious content, likely phishing or a trojan downloader.

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://druttle.ru/strik?utm_term=what+oil+to+use+in+cub+cadet+xt1 PDF link annotation
    • http://nozudozaki.22web.org/chori_chori_song_kulbir_jhinjer.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/heclift/43951137830.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/ynhfjiB/rozifuremixosulawefe.pdfIn PDF document text
    • http://xaxifibipebux.iblogger.org/kadamep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412762/normal_6000ad46c72fb.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/Phcyie4/buvederotajobub.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/hbgdhgO/bovatosurapuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/Wd6Zjbf/10775651846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_600be79285f40.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/ijcidia/8215779011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavodusepigixu.rf.gd/let_s_go_pikachu_shiny_guide.pdfIn PDF document text
    • http://perabepukemebu.epizy.com/30680510465.pdfIn PDF document text
    • http://nividibewejoba.rf.gd/97247234596.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/free_fast_browser_for_pc.pdfIn PDF document text
    • http://nenujogi.rf.gd/boberuwedadaxakefeximuvej.pdfIn PDF document text
    • http://runesufosufej.rf.gd/36086803382.pdfIn PDF document text
    • http://tiluremuxaz.epizy.com/35983146495.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 5204 bytes
SHA-256: c60ce9d61418a3b9dff0c65ec2bad773cb7628e44779cec5ebdd645c6a704428
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 9940 bytes
SHA-256: 4c6ee52d902a8fdd29d38dea43133097615d9f2afbe162b86288ee94f1abcd0a

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