Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d30886599ce481…

MALICIOUS

PDF

75.2 KB Created: 2021-03-17 01:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b60858043c6c6b38a676c3e21fb620c SHA-1: 205f305daded51b109278fa538bdf611d462f729 SHA-256: a8d30886599ce481ee22abffa2c428f04e4ec6c069c7b28fc915c5373ca8de98
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/strik?utm_term=3+rivers+fcu+locations+fort+wayne PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485436/normal_602ea54289cf5.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/how_do_sharks_defend_themselves.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/office_365_admin_center_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_60293b74498cc.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/watch_hunger_games_mockingjay_part_2_online_free.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/catalytic_reaction.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/95788013212.pdfIn PDF document text
    • http://logawedulukudan.mywebcommunity.org/evermotion_archinteriors_vol_33.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/little_house_on_the_prairie_stars_that_have_died.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://wurebosuloxu.myartsonline.com/68356671754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93654a6-2dbc-4dea-8bf3-eebc38083d7e/coursera_introduction_to_project_management_principles_and_practices.pdfIn PDF document text
    • http://wesatume.atwebpages.com/wukopemukaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80bff12-c17d-464a-97a5-74c1b82fe2ef/right_triangle_trigonometry_word_problems_worksheet_with_answers.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/2670940075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4f2cb4-3bae-4b56-b414-930f2b472b91/what_does_bow_symbolize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c640a6a2-c171-4331-a329-ce8b4eb530b7/futunodegodaxaxedaxodukav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebddb000-7594-4571-bd72-6479bb84d44e/kumegubusenebiwo.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/sezol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f3067a-9afe-4fc6-afe1-9128d02b30f4/dofigegukoz.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/canciones_catolicas_acordes_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31012c9-b22c-4ac8-a76d-110e7d135176/schwinn_comp_bowflex_parts.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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 5080 bytes
SHA-256: f04076b5cbffa17c5cb4cfaed6b7f68eb010674ff7c63141c636dccb3b65cf2a
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 11432 bytes
SHA-256: a4822164719d5d61135f9a5faa57e75fd86c7eb16ccfb74e355d6f9ea0c4a876
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361