Malicious PDF — malware analysis report

Static analysis result for SHA-256 999ea8ccc9e74268…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 19:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 92c3f349adf18aefa9bf4be0c13495d3 SHA-1: 20428b10bf1141ccedc922e6c35d0ee42af5fe90 SHA-256: 999ea8ccc9e74268b79e64a64a8814e471f4d3f5edf0ca2a0f8dd8a7957bb555
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

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://golowaki.ru/award?keyword=objective+agriculture+books+pdf PDF link annotation
    • http://zujewap.mygamesonline.org/37070489859.pdfIn PDF document text
    • http://sufekuxuxujaw.iblogger.org/best_price_saeco_coffee_machines.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/which_of_the_following_is_a_topic_that_would_be_studied_in_macroeconomics.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/honda_civic_ek_service_manual.pdfIn PDF document text
    • http://sutobep.getenjoyment.net/jajufunuvawupivanudek.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/dotefudisumutisokuvugivo.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/iijhbhf/joom._shopping_for_every_day_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/gubusase/jVBhb8A/life_is_strange_games_chronological_order.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/steve_jobs_the_man_who_thought_different_chapter_6_summary.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/40627146687.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/mwygjjc/digital_marketing_internship_application_for_gnmx.pdfIn PDF document text
    • http://gudibetujem.iblogger.org/berisemofezawelizutetulik.pdfIn PDF document text
    • https://vopusufibos.weebly.com/uploads/1/3/4/7/134731751/kesiladomapuro_pevusa.pdfIn PDF document text
    • http://telupizevos.iblogger.org/fafosamowuralupuxedevexid.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/wetifatezi.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://jirabasojexosud.atwebpages.com/physics_1_chapter_2_test.pdfIn PDF document text
    • http://jipuzekas.rf.gd/carya_cordiformis_uk.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/karedeparaxama.pdfIn PDF document text
    • http://jigigapapidafe.epizy.com/nccn_guidelines_for_lung_cancer_screening_2018.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_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 5464 bytes
SHA-256: 8d871908d826e58ea9062cc7d4ef16d25430b02e59bc48504ba9b8f209232620
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10508 bytes
SHA-256: a88a2c7014eea0eca17e098e1f4fe4efe15b3225fa43fe81f853f948382bf91d
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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