Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc95c273194eb31…

MALICIOUS

PDF

74.0 KB Created: 2021-03-04 18:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6112be77352023e65c60a46792b1e009 SHA-1: f548483d73a69a2d89c4c8616b3b21653bed64ba SHA-256: 8cc95c273194eb31e16dc78c3988e61e2dc8297b163d59c4660b016d4591421f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. The primary URL, jumiwimov.ru, is disguised as a product review to entice clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to drive traffic to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wb?keyword=ridgid%206%20amp%206-1/8-inch%20corded%20jointer/planer%20review PDF link annotation
    • http://jobware.pro/kuzimalugekafadb1jj.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/jeUjdjf/torn_labrum_symptoms.pdfIn PDF document text
    • http://fartook.online/linux_system_admin_interview_questions_and_answersdsvo1.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/06ef7250.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/bSphiK4/paris_texas_white_snake_boots.pdfIn PDF document text
    • http://copyrighytsupport.com/76919073502txifv.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/VHAX6GL/liverpool_fc_live_wallpaper_for_android.pdfIn PDF document text
    • http://testertumentum.space/how_to_update_verizon_jetpackwlvuj.pdfIn PDF document text
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/6727236.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/tadod.pdfIn PDF document text
    • http://info-pages.ru/sinaxafifadimngz0o.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/jQyiaIJ/stuntman_ps2_iso_europe.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/68225289-bfc7-4bdf-9532-e46fc88224a9/80193113798.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_fbb92900acfc4c1492a18a25318ee70d.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_c9b1931204e34d94a6c1267378d8fe3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba19e78-3371-4657-893e-6cabcc07c958/ladipukasanutuwajoxuvex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c06713-ec66-46a5-9828-a4ef65f6b271/sivumafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cff3965-ac6c-479f-bb13-f9fc0afcd589/74557058599.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_45057f0b611d4cd5b57f7218feef3578.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cead88-1481-4aed-92f5-92745f8c551a/rivevitekejexupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960502a9-0097-407a-bcfe-c80249d1c241/negazegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc81d88-440e-472c-920f-7721cd69daf3/cuales_son_los_medios_de_comunicacion_que_existen_en_guatemala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122e1dca-1732-4410-8d13-5a309d481c2d/bose_sounddock_troubleshooting_no_power.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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 6012 bytes
SHA-256: 1687cec860b9eb8ceffce22c07fbebf3e09256613ccb54027fec0655d770923e
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10616 bytes
SHA-256: 0959c5304ff3b21fe1c79ac97034db93363b3764ba410cfcd7fbe3b3f054595f