Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d1102d71762db5…

MALICIOUS

PDF

77.9 KB Created: 2021-02-27 14:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 931046c2656ebbdd66a01880c3e7f02b SHA-1: 9aed33bd88f7f5fa5b6b0faef7050080a1da738c SHA-256: 20d1102d71762db5034e38f9b31fd1734102c5ed9c1f865384342b5509c33e59
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to job applications or courses of study, aligning with phishing tactics. The presence of external URIs and link farm heuristics further indicates an attempt to redirect the user to potentially malicious content.

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://jottigo.ru/wix?keyword=course+of+study+elementary+job+application PDF link annotation
    • https://cdn.sqhk.co/xalibolopov/6dicjgC/dude_perfect_stereotypes_halloween_bloopers.pdfIn PDF document text
    • http://tazizaj.iblogger.org/code_128_font_for_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/eEzmidB/company_of_heroes_2_franchise_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/sjeifEj/english_songs_list_download.pdfIn PDF document text
    • http://requiredjokblog.com/2299641733inz3u.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/iedihZC/marketplace_cars_under_10000.pdfIn PDF document text
    • http://autokenn.com/rudepikejoludosiruwomove5ti7z.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/TpgdJJJ/draw_hills_moto_race_draw_road_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_601d1874f3d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_602ee0a7c8c59.pdfIn PDF document text
    • http://neuroncraft.online/latest_whatsapp_apk_uptodown0zo33.pdfIn PDF document text
    • http://zespodsvetkoy.site/dibujos_para_colorear_con_operacione962bl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471710/normal_5ffa1ec45ca37.pdfIn PDF document text
    • http://wei-nmvc.com/fender_twin_reverb_schematic_silverface8vpe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisiwiruligeg.epizy.com/23389691947.pdfIn PDF document text
    • http://dosunadis.epizy.com/sifizuzosezulazeboja.pdfIn PDF document text
    • http://zarirebotiz.rf.gd/red_tailed_hawk_spirit_guide_meaning.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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 5524 bytes
SHA-256: a0d92ebe2ec5d4958c47c915f8b301c022e8bac55f3bec76c59d4231266bdc00
font_01_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10492 bytes
SHA-256: 6eb848daf8389e56b04c82ad6de56fff1ecc54fb250a4ac19c6c365b3efb2201

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