Malicious PDF — malware analysis report

Static analysis result for SHA-256 3833d11f8bebc057…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 16:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95e63799a7d25a296037c82dceb02d48 SHA-1: ed4ca5547661a46f704b166773e86e38e0a6f7e7 SHA-256: 3833d11f8bebc0571ac473a72aa83c2f9270158d682fc3ecdcc54a301f4d71ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing lure. The embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=veeder+root+not+printing
    • https://cdn.sqhk.co/livixugakuf/tvghkjh/badlands_hunting_sale.pdf
    • http://kopuvimu.scienceontheweb.net/77760631121.pdf
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/c40f3d1.pdf
    • http://datujizid.iblogger.org/learn_how_to_play_electric_guitar_for_beginners_free.pdf
    • https://cdn.sqhk.co/nobipajami/ciijaBF/37424894233.pdf
    • http://zipubezexupoka.mywebcommunity.org/pipaki.pdf
    • https://cdn.sqhk.co/limexofure/giihgcF/4194520650.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/xajotozavudoxodepamu.pdf
    • http://tefetugadul.22web.org/cuanto_equivale_20_centimetros_en_pulgadas.pdf
    • https://cdn.sqhk.co/judixixelof/ifFhXnB/lofazazivajalezemu.pdf
    • http://zugawumaz.22web.org/best_resistance_band_exercises_for_flabby_arms.pdf
    • http://rajukilodagoje.mygamesonline.org/primo_bottom_load_water_dispenser_cleaning.pdf
    • http://mukinumatonewo.getenjoyment.net/buddhas_brain_chapter_summary.pdf
    • https://cdn.sqhk.co/livoluxuwad/uADjiyX/boston_fruit_slices_candy.pdf
    • http://rebezun.mygamesonline.org/mowenavepefo.pdf
    • https://cdn.sqhk.co/rosojolude/jjnJnKQ/rodasobexin.pdf
    • https://cdn.sqhk.co/posiraki/jaaTrOd/come_creare_gli_stickers_su_whatsapp_iphone.pdf
    • https://cdn.sqhk.co/vizelupavew/ja48Giv/5096788377.pdf
    • http://nigoguno.scienceontheweb.net/96584286494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wutejaxevewef.myartsonline.com/what_does_viking_runes_mean.pdf
    • http://xekazaz.myartsonline.com/98989331647.pdf
    • http://jitemawuvefogox.epizy.com/what_is_idiopathic_developmental_intellectual_disability.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d628.bin
9f46138e55dab4464f2d72ccd668c27abd4aede4c2da9a7fd4138c73f7319df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 4460 bytes
font_01_sfnt_off0000e55e.bin
a64ebbd57b5a96cf0e4e0b0f92a07a9abec160da0cb1431eb706ed82735821ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 11148 bytes
font_02_sfnt_off00010b6c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 4324 bytes

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