Malicious PDF — malware analysis report

Static analysis result for SHA-256 15383eceed521f4a…

MALICIOUS

PDF

79.0 KB Created: 2021-04-03 07:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f0d172a58b330cb4a486fa9f0bf6d32 SHA-1: d5899bc2b013b03409966144d5a20808b8f28360 SHA-256: 15383eceed521f4ab3b93d0cef2b0a69c888e1146058b24a8cd43a96d6843b25
186 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. 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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=what+miracles+did+god+perform+during+the+red+sea+crossing PDF link annotation
    • https://cdn.sqhk.co/vadetegubufo/hjbzJhh/sas_visual_analytics_dashboard_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/gl9ghzO/minecraft_lan_proxy_servers_on_ps4_xbox.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/eO0sFid/76989610362.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/jdggsEM/46820976603.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/fQB0Hjb/mountain_climb_4x4_offroad_car_drive_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/ecDhiYj/rainbow_crayon_epoxy_table.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/93721234320.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/j1ORBhi/bundt_cake_recipes_dairy_free.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/b3f6c798-1eeb-458b-a380-57247e36a7bf/breville_mini_smart_oven_cookbook.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_edfea77172bf481c8354ce8d6377b55c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b92c030-dc3b-4944-a0e4-e3aba80df37a/44021061264.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_5b2b227ec8a045f38442ba6163a0f4b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b2e194-9513-4353-8ca3-89e09b51868e/pokemon_sun_and_moon_expansion_card_list.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_616c79e257284b26a462986d746474d4.pdf?index=trueIn PDF document text
    • http://labopum.rf.gd/kubulovukivunojujafovewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70ae1cc-f761-4fcd-9166-7886d46235ab/fimitovafewotapipo.pdfIn PDF document text
    • http://jifumoxu.rf.gd/titijulasatobefedoba.pdfIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/53435522752.pdfIn PDF document text
    • http://pijiwir.rf.gd/82069139361.pdfIn PDF document text
    • http://sesilav.rf.gd/48739037154.pdfIn PDF document text
    • http://lifobem.myartsonline.com/cathodic_protection_design_calculation.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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 5580 bytes
SHA-256: f7dc9d8b8461e33cbda0c76d71127486de69bdecee9e0fe4bc1b4beb11a92a76
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11320 bytes
SHA-256: e7c888194ba36e3aa0d3fb085f262c0a4172cdd40c27526c8f7556a7acc9f733