Malicious PDF — malware analysis report

Static analysis result for SHA-256 90daceebd621e0b9…

MALICIOUS

PDF

79.1 KB Created: 2021-04-12 02:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 76560b20c3ea7ed164addba09ee4389a SHA-1: b0c6bab80bb8caa6a30a603d6f9f3c14eda9c01b SHA-256: 90daceebd621e0b9d75ca8c6e221a501758d8370cf5a322385a8742d5b040ef2
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding numerous external URIs across various domains, many of which are hosted on disposable infrastructure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it may be a generated document used to disguise malicious links.

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://xezojetit.ru/strik?utm_term=phantom+of+the+opera+broadway+plot+summary PDF link annotation
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/loxoloxafegewuke.pdfIn PDF document text
    • http://basvuruizleme.online/leckie_and_leckie_higher_french_success_guided5odz.pdfIn PDF document text
    • http://raifaisentapp.online/computer_chapter_1_class_101ik98.pdfIn PDF document text
    • http://expressday.online/the_magicians_season_5_episode_9_air_datez4u9e.pdfIn PDF document text
    • http://terem.space/dunutipamazosiq2co.pdfIn PDF document text
    • http://goldenframecollision.com/what_is_bts_personalityg6ggl.pdfIn PDF document text
    • http://creditstar-kabinet.com/how_to_set_heater_in_acg8i0z.pdfIn PDF document text
    • http://dutuxagedam.66ghz.com/mcdonalds_job_application_test_answers.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/5570456.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/holjbih/zeridapewirar.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/iETghh4/simugusoluzabizu.pdfIn PDF document text
    • http://mishabelle.ru/29467570614tdxt6.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/jornadas_de_cura_anodea_judith.pdfIn PDF document text
    • http://trydouche.xyz/72873030053iogfm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://semofif.epizy.com/learn_japanese_textbook_free_download.pdfIn PDF document text
    • http://pawupokativebak.rf.gd/sokikig.pdfIn PDF document text
    • http://xixupokolaxusuv.epizy.com/cause_and_effect_reasoning_questions.pdfIn PDF document text
    • http://pixutixiziv.epizy.com/jakod.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/orbit_irrigation_lcd_2-port_digital_hose_digital_hose_faucet_timer_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5452 bytes
SHA-256: 05076a78fecf2e94af5d91ab15620ef3dc978e63b675d003dd8ea4b1a4a0c029
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10432 bytes
SHA-256: 065269f8d03d53eaebdf315cccdc776880140449f53579e1718e8415d1dff2dc
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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