Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4194cef74571233…

MALICIOUS

PDF

73.0 KB Created: 2021-03-05 10:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9cf791205e310965c44b1883257d4721 SHA-1: 84ce8793860589bab57a0d341ab961b523576643 SHA-256: c4194cef74571233e0efc6578e1a6c275767d96c4e783d2a2a9a75d786c6596a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites for further exploitation.

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://jumiwimov.ru/123?utm_term=what+are+the+assessment+tools+in+learning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fefbfc048a2e.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/gfgcigN/meta-_universe_definition_science.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/Gghibh6/wood_carving_designs_for_sale.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/namewunaxurusumirux.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/ijAs2hg/new_english_songs_free_download_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/ihihleP/68411725796.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/iJCN458/fear_the_walking_dead_nowe_odcinki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394073/normal_5fff71b836cdd.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/47jcail/billie_eilish_i_love_you_lyrics_explained.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/whats_the_difference_between_jbl_charge_4_and_flip_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_6031d6a170f26.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/61227843239.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/hbhbFQZ/52103650742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulutugorivexek.atwebpages.com/what_do_esc_beeps_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/weber_spirit_e_310_review.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/algebra_nation_section_1_answers_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/puma_air_compressor_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/convertitore_to_word_online_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/vimakaxowa.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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 5112 bytes
SHA-256: 2cb5626c153d83bb31f0a85606e3e5c3a42560b642d788a38533875b5310ca46
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10816 bytes
SHA-256: 962792806db45638b16d783860009f6ced03a849308c0a4c5fd4039af8a13443

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