Malicious PDF — malware analysis report

Static analysis result for SHA-256 57529528f4ba4223…

MALICIOUS

PDF

77.7 KB Created: 2021-04-22 14:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 57bcd881930b23f46a20aa1e6224959b SHA-1: f4db1830a32f303919e6dbfb3ebe459c6e0acb8c SHA-256: 57529528f4ba4223d2918b83be7c80b7f5776c7440fc89eebce22f7e9d32968f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to URLs and application metadata, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=a+feast+for+crows+chapter+38 PDF link annotation
    • http://fiwisud.getenjoyment.net/how_do_i_reset_my_service_airbag.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/jaT5u2h/decisions_choose_your_interactive_stories_choice_mod_apk.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/costing_and_estimation_book.pdfIn PDF document text
    • http://zuluwana.iblogger.org/zuwodiga.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/gejfOzO/babefotudemudevuziweg.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/Jjj2jge/automatic_background_changer_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/Eyihjg8/smash_the_glass_bottle.pdfIn PDF document text
    • http://xaritilufowav.22web.org/22718814373.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/87171021865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_257b8577c41b41da909b46ab792ee323.pdf?index=trueIn PDF document text
    • http://notadagas.rf.gd/jogekowugunaremokilo.pdfIn PDF document text
    • http://boxugajot.rf.gd/33382063785.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/suvojuma.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/12662376177.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_1d391fb45c8d453c8daf703ec70a4137.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_a0c664efb7a04169adc7ca12b67fcacc.pdf?index=trueIn PDF document text
    • http://budunasetixap.epizy.com/kibekosusopa.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/bezegedanerix.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/domestic_disturbance_police_report.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/82547601802.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/mcenery_corpus_linguistics.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_116ca128e5e2404aabc15e715f3ae853.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/66670512207.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_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 5512 bytes
SHA-256: 354cc4ca9f6c4dcbb2a15fab1a1308b498ba418bd696e1a97b0e51a2fc08406a
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 10268 bytes
SHA-256: 69d666ed91ea25250e8457dc928e903799ff58b3539d7df57d4aa8fb4f5028d7

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