Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a214e5dc64e110…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 01:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a22004fb97829a8bec5d46715bd42b18 SHA-1: f3c96e794a1390ac45e6b9b53e79ba4e852dae0d SHA-256: 28a214e5dc64e110de6e028212c37f4d7ad02fb86bcf6d6f15b0e16cd28a1f7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=2008+honda+accord+ex+maintenance+schedule PDF link annotation
    • https://cdn.sqhk.co/xaxovowupofa/fijNzjb/61148828143.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/2jancjh/amazon_alexa_setup_without_app.pdfIn PDF document text
    • http://krepezh.guru/12777926692zexpc.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/bilede-varanese-povujajasi.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/against_the_gods_the_remarkable_story_of_risk_by_peter_l._bernstein.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/29870707207.pdfIn PDF document text
    • http://pubguckazan.com/soccer_football_prediction_bet3pe2i.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/zezukare.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/5ifhe7K/ninja_fighter_game_free_download.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/how_much_does_a_ps3_controller_cost_at_walmart.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/a25494.pdfIn PDF document text
    • http://tradebot.space/download_uphill_rush_water_park2law5.pdfIn PDF document text
    • http://terugate.mypressonline.com/why_would_my_check_engine_light_be_flashing.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/3120143.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/wulav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liraperuwuw.atwebpages.com/dasej.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/common_american_english_words_used_in_daily_life.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/way_to_clean_a_waffle_maker.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_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5620 bytes
SHA-256: 593d90b0f9694dbeb3c23adf1d9718f791d0b418cfb8fb0a6c9e4c537e36b47d
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10704 bytes
SHA-256: b762f0efc4fe814f540430867b7c084fbfe07ae138438954f7f63f53e8acefcf