Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86d779022620852…

MALICIOUS

PDF

91.5 KB Created: 2021-03-09 07:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c088c8d5beb48fc8a3583db12525c6e SHA-1: 9650688f3c06d7eb058018ec6f0596d184dd6358 SHA-256: b86d779022620852e84a62e04d9918c9b2b47c1c406aea91f096de0f02f38ffe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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://midufefew.ru/strik?utm_term=what+is+the+basic+contents+of+educational+psychology PDF link annotation
    • http://teachersaid.fun/dnd_5e_ranged_spell_attackjtpgc.pdfIn PDF document text
    • http://sallehq.xyz/25110431507zvgij.pdfIn PDF document text
    • http://bellissimo.online/vivukoziwasuguratc9445.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/nagutovidurezuxe.pdfIn PDF document text
    • http://joy-todays.online/how_to_write_a_warning_order_for_the_army2lyrm.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/bibliotherapy_books.pdfIn PDF document text
    • http://santaparker.store/skyrim_se_vampire_hunter_armor_mod5kgpc.pdfIn PDF document text
    • http://yatvoyya.fun/tisakigevuf3raw.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/josanax.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/brookstone_bluetooth_speaker_big_blue_manual.pdfIn PDF document text
    • http://doctorzlo.com/1984_chapter_2_discussion_questionsfmrhy.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/dummy_escape_literaturex1cd5.pdfIn PDF document text
    • http://meetraisins.club/can_i_see_property_lines_on_google_earthiey1b.pdfIn PDF document text
    • http://bahis-sikayet.com/baby_shark_cake_popsip47h.pdfIn PDF document text
    • http://genusadnlo.space/sigatosavovumifubopix168mh.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/guzerikanuziluruvuz.pdfIn PDF document text
    • http://libertinemodels.com/55593998432v48mp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ddbedd-71b0-45ef-8ef7-fd078cbcfc5a/epson_wf_2630_printer_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a37328-575c-410d-8256-b9d2ec3a542b/26999781386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a49d51f-6d00-48b4-81c6-c11aa084595d/free_blank_world_maps_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021ac751-7a00-449e-9e47-a97a9806f9a8/92073666211.pdfIn PDF document text
    • http://tosurok.myartsonline.com/red_lobster_nutrition_facts_2021.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/35679097300.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_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 5576 bytes
SHA-256: 51b543312fb0aaf25736067addfbdd1c7f69337f699676cccbe8aeb85e03ed5f
font_01_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 10836 bytes
SHA-256: 8bdef168fb600db987a87ea7f2ba1169467727498a38448b88784109216291d7

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