Malicious PDF — malware analysis report

Static analysis result for SHA-256 9412bdd27c6f60d3…

MALICIOUS

PDF

72.2 KB Created: 2021-02-27 09:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f8797799d77f721fd570964bbfe6fcd6 SHA-1: 375e8b2e67c590997bb37109ec6b3d82ed8673f4 SHA-256: 9412bdd27c6f60d3f27a84a2f0df7f8d5250dd6449f528f2b1a44b48f6b0ae98
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one notable URL pointing to 'kuzutuzo.ru', suggesting a phishing or content-luring attempt. The document body, though heavily obfuscated, contains text related to a "Chevy 350 rebuild manual download", which is likely a lure.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/aws?utm_term=chevy+350+rebuild+manual+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426571/normal_602224b05c9fb.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/40001866701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5ff70851f0f02.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/jivafuzijunajubiw.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/dungeon_masters_guide_fifth_edition.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/rakonoloxukekem_tuwunuzufogule_jufesudebajawu.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/what_are_the_4_books_of_islam.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/xebin_zeziwufubov_wirotolaweruv_gelinemadol.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/fonazuzixagizir/litilevejupilituzuzakilas.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/loaded_questions_game_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/19432983246.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/adoration_benediction.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/40305596346.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/kilakalitujelamapimajixex.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_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 5616 bytes
SHA-256: d914109e9941c3d7a0ae2deb29254c26c4631586fd4f281b22c792ecc255f176
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 10856 bytes
SHA-256: 9e382902527f55444bf23002669bbabfb0caa0a99108631124207586ad7cfb19

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