Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df41b6872beaee6…

MALICIOUS

PDF

80.2 KB Created: 2021-05-04 12:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f0b1e0aa3ecadedbf7a9b7cc783704c8 SHA-1: 2363ceae7bf33d1ac2e8eb0963e564fd624d2345 SHA-256: 1df41b6872beaee69a0330748052f2d69682740e150f20b10d15a70bb92ebf40
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://pelibifir.ru/strik?utm_term=tabla+distribuci%25C3%25B3n+normal+n%25280+1%2529 PDF link annotation
    • http://mirumumavetifun.mypressonline.com/what_are_bank_holiday_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/dIzpie5/minecraft_2d_mod_download_1._7._10.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/yGhQoif/hill_climb_racing_3_online_play.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/bwghYjg/tugezewigo.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/AibuA21/cartoon_network_app_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/fuhiCja/juroxirusuxi.pdfIn PDF document text
    • http://pivifemopore.22web.org/kali_linux_raspberry_pi_zero_wifi.pdfIn PDF document text
    • http://xusojuvexo.22web.org/99330403587.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/TDjd2he/kovupajaf.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/56718767755.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://kojurebajalafaw.22web.org/best_flash_video_er_chrome_extension.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/delhi_metro_map_with_fare_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_f3a1063ac0d7401fb0462d957d2567fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/ceftriaxona_eurofarma.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/kitchenaid_toaster_oven_knob_replacement.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_20939dffcdd6496ab0fdec94aab583fe.pdf?index=trueIn PDF document text
    • http://vubixijugisoloz.epizy.com/tosovemewim.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/41730442823.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_dc3d3bc106954b3890771ff4b59cf3ae.pdf?index=trueIn PDF document text
    • http://sunuwib.epizy.com/desert_southwest_insurance_brokers.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_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 5656 bytes
SHA-256: fec8dbd45dfbd6b539b269de734e5cd5285562242a88211782f5e137b6de0382
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 12404 bytes
SHA-256: 51645954547d02dc50c4b1329e50ef6da8460bf7e5c5a5d913d6d7ba190eaf90

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