Malicious PDF — malware analysis report

Static analysis result for SHA-256 597130cd23962b77…

MALICIOUS

PDF

64.7 KB Created: 2021-03-10 03:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 034c8856a0337ff02c4cf65b307e4a21 SHA-1: e5448b5d178ae0dc34ee20dd57d13abb17e4273c SHA-256: 597130cd23962b7740f9999c2d930ce72d77168df13fc79e9aff1e752a87c1dc
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that appears to be a search result lure for educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wb?keyword=slader%20applied%20calculus%206th%20edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ff80eb9c30bb.pdfIn PDF document text
    • http://jijegak.22web.org/pijemifizan.pdfIn PDF document text
    • http://cashthe.ru/scope_and_sequence_template_nsw1yri8.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/haxODty/dragon_city_gems_generator_no_survey_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/gjkvehg/wuvinazotor.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/icQMijG/javuxiguxitabijigude.pdfIn PDF document text
    • http://mafewagidimu.22web.org/gaguzulegotiborowuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/xIUAjgd/bomber_friends_mod_ios.pdfIn PDF document text
    • http://littlenat.space/niwojovylajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_6009a6f48c853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_600fd482ce8b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6041cb52a5b8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369664/normal_5ff2699b5f08b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_71351e8ac5614dc6b2a037a8a85a812d.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_6bf7a6ad38064eda93b959ab8a14af21.pdf?index=trueIn PDF document text
    • http://zekarevuwo.epizy.com/wimeb.pdfIn PDF document text
    • http://supisozireb.rf.gd/the_neverending_story_lyrics_dustin_and_suzie.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_3811bb413a964ea09418d4b8a7a04aea.pdf?index=trueIn PDF document text
    • http://wijetifosoxi.epizy.com/banner_design_vector_template.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_off0000c3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A2 5416 bytes
SHA-256: 8740e1c7b1891ec76c2412c57959f41027ed9d8b5c2819e9e5a2c9c2515eefa9
font_01_sfnt_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 9312 bytes
SHA-256: 8ad7e32ebc4c07020ba116dd781736d8203439188a9cc36bf471c0df99992566

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