Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd0230f382966c…

MALICIOUS

PDF

73.4 KB Created: 2021-03-01 12:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57547ad002e37707cae396f5d9595ef6 SHA-1: ab451f36a8f6f1ee9d1868d4c9fd8554972d3344 SHA-256: 55bd0230f382966ca91d36cb6e84e86461ed16346467896a935f41e914ce20fc
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'https://mezovuduw.ru/strik' and a query parameter suggesting a lure related to unlocking an oven door. The presence of a link farm on disposable hosting further supports a phishing or malicious redirection scheme.

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://mezovuduw.ru/strik?utm_term=how+to+unlock+oven+door+latch+stuck PDF link annotation
    • https://pekidajisin.weebly.com/uploads/1/3/4/4/134476355/48af6d.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/etib8ic/surifemu.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/mexepe.pdfIn PDF document text
    • https://cdn.sqhk.co/kidirugolo/hbyiUTc/vogasovitozapujo.pdfIn PDF document text
    • https://fegejakir.weebly.com/uploads/1/3/5/2/135299458/8151028.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/5501606.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/egmLjaI/86406292575.pdfIn PDF document text
    • http://card2card-perevod24.site/will_tales_from_the_loop_have_a_season_214y83.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/jfihcge/guvivol.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/e37e0f31a809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/xomeje.pdfIn PDF document text
    • http://bukinajomo.epizy.com/bharat_full_song_video.pdfIn PDF document text
    • http://bisavosimirot.rf.gd/rupinder_gandhi_1_movie_hd.pdfIn PDF document text
    • http://genenapukiral.epizy.com/collins_grammar_for_ielts_cd.pdfIn PDF document text
    • http://jegovogetaferop.epizy.com/in_book_of_the_courtier_what_were_baldassare_castigliones_thoughts_on_music.pdfIn PDF document text
    • http://napupitupevis.rf.gd/36149208927.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5204 bytes
SHA-256: c2c50442f74120d011fd27ed85507de4a497ad8e4ba2133bb86f39295ef294a7
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10252 bytes
SHA-256: c34f7780ce55fc025ac9e58658f68ce15790b9c619e45242344ae281c4bb8dfe

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