Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9f949071990f59…

MALICIOUS

PDF

75.5 KB Created: 2021-03-01 21:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f8c8060fb1b2041890043559f1f437df SHA-1: 25018a876ff9918f4480f047990b6a3b9a477fa0 SHA-256: 4f9f949071990f5985a86c18d7ce82cd23d028813ba048953e32737dcce9d747
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=contemporary+topics+1+student+book+pdf PDF link annotation
    • http://zoosalon.org/ascending_order_program_in_8086_microprocessortd0nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_60302058f2acd.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/bivugitexe.pdfIn PDF document text
    • http://mscredit.info/cisco_ccna_exam_discount_voucher1od6a.pdfIn PDF document text
    • http://makeyourself.xyz/the_lion_the_witch_and_the_wardrobe_series_movies2o343.pdfIn PDF document text
    • http://creditscorecard.info/moredegutigonumvvr2u.pdfIn PDF document text
    • https://cdn.sqhk.co/midusuworab/J8idXcw/soccer_champion_head_football_kickstarter.pdfIn PDF document text
    • http://sberin.xyz/partnership_fundamentals_class_12_questionszft64.pdfIn PDF document text
    • http://qupieasy.online/holt_call_to_freedom_online_textbookmaktn.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/hjaVicz/sinus_cavity_diagram.pdfIn PDF document text
    • http://yazansoft.com/business_essentials_12th_editionmwsft.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/4BhhigZ/cops_n_robbers_2_jailbreak_download.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/how_do_i_fix_e7_error_on_treadmill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367667/normal_600396f21af37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_60357415965c2.pdfIn PDF document text
    • http://gasiwine.iblogger.org/11856798924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizokokov.epizy.com/48992695299.pdfIn PDF document text
    • http://dogugamegomijit.rf.gd/xoxol.pdfIn PDF document text
    • http://lipisalozolujew.epizy.com/wiluse.pdfIn PDF document text
    • http://lewarojutuveg.rf.gd/fifty_shades_of_grey_2015_full_movie_download_in_hindi_300mb.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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 5532 bytes
SHA-256: 8817890d0daecaa71e51aad7ffc78f72a2672dd393c599b9e118959b6fccdf87
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 10616 bytes
SHA-256: b867e3201ae44d6ee2e11eee19ef4162244b000ceaa52fd7b631482e4dfbdeb1

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