Malicious PDF — malware analysis report

Static analysis result for SHA-256 96aaf033f3eae17a…

MALICIOUS

PDF

90.7 KB Created: 2021-02-28 02:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 82cb15b75e5d598bb6eb8dee7d634498 SHA-1: 995061e81e691774d8ed318491dd0e3293ee6636 SHA-256: 96aaf033f3eae17a25d4add4b26e2a958b8efc3a0224d354e62a4b18d12c7d69
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many hosted on disposable domains, indicating a link farm or redirection mechanism. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing or trojan variant. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to direct users to potentially malicious external sites.

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/award?keyword=reacciones+de+neutralizacion+ejemplos+formulas PDF link annotation
    • http://tezuveripoxub.mypressonline.com/13_reasons_why_season_2_detailed_summary.pdfIn PDF document text
    • http://luminar3-download.xyz/intgramme_en_lignesjanp.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/hdhjnSC/hexa_1010_block_puzzle_game_mod_apk.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/the_school_for_good_and_evil_book_2_read_online.pdfIn PDF document text
    • https://mifadumuvuvog.weebly.com/uploads/1/3/4/6/134689338/vapuvoledamaxoru.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/zurobetakureriru.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/zawajoxamowaletes.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/0Rgcgda/reigns_game_of_thrones_switch_review.pdfIn PDF document text
    • http://myluckywin.site/neruda_100_love_sonnetsx7lyn.pdfIn PDF document text
    • http://x-bionic.shop/how_do_you_head_a_paper_in_mla_format6jtd0.pdfIn PDF document text
    • https://lapolepep.weebly.com/uploads/1/3/1/4/131406498/pikakuza.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/7Tqgfig/41194856803.pdfIn PDF document text
    • http://storeyou.store/collage_maker_software_free_onlineput9k.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/7b008b33c561a.pdfIn PDF document text
    • http://dududuw.mypressonline.com/wozasimekoripitud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/how_difficult_is_the_hike_to_the_wave.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/punagupefika.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_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 5432 bytes
SHA-256: 91ec13b86a79ee3aa5894830ca7c6374dab9c1b16feaf64971655fac435e3b8a
font_01_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 12732 bytes
SHA-256: 8b2d6df76da93ba31ca807cd6768cec9fe28c9acd4163c80b1110e432d44381c

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