Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c610e9b2da15c1…

MALICIOUS

PDF

71.5 KB Created: 2021-03-12 04:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5983973ea277787bffdb644c887ea3ea SHA-1: 748d34735e665a7c9748a08bcd43d4a7a87f076c SHA-256: 52c610e9b2da15c14944bc77f4ed8c29fbf494e57e1e649e08546884128c2529
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one specifically pointing to 'https://golowaki.ru/award?keyword=chemical+pathology+textbook+pdf', suggesting a phishing or redirection attempt. The presence of multiple distinct hosts and a link farm heuristic further supports a malicious purpose, likely to distribute further payloads or conduct phishing.

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/award?keyword=chemical+pathology+textbook+pdf PDF link annotation
    • https://cdn.sqhk.co/rubogomuweme/hjWA8gh/glory_ages_samurais_gameplay.pdfIn PDF document text
    • http://blockingscenery.com/buwebovilopoguzjpd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_6024bee4f35be.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/hBxjcgj/java_jdk_11_linux.pdfIn PDF document text
    • http://kellys.space/wogiwotoxawadokoruporpk1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_601009db910c4.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/gH4Oidn/easy_launcher_gold_mw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_600aea2c7b5c5.pdfIn PDF document text
    • http://characduwe.space/what_type_of_god_is_freya0ry7s.pdfIn PDF document text
    • http://hookup154.space/music_theory_for_dummies_piano31t12.pdfIn PDF document text
    • http://dmgameplan.com/identifying_functional_groups_organic_chemistry_practiceib7ds.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/pyxhfXA/tamed_arctic_survival_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/iZwEBgh/33868266103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/past_simple_exercise_7_regular_and_irregular_verbs.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_c0b6d3fdc3774d65976c2e64d2b8916b.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_9d88e6d0aa894d158817380a3488d641.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_9156dd540bb84758a5a21e54cbe72231.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/zekekagamesovaregejubeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/13276813086.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_2035c4e8dd72437a95009dbbec7cf854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/kisurorubazewa.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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 5576 bytes
SHA-256: 49d2d6d38b009036d11cc78d314da924ca9d7c4207f1fead49e0c4c6aa6c30bd
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 10524 bytes
SHA-256: b899a5ddca34b70d589dd041eb906fa3e462630f13e90ce7e43c876efb7f1264

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