Malicious PDF — malware analysis report

Static analysis result for SHA-256 b200022ab19977a6…

MALICIOUS

PDF

77.5 KB Created: 2021-06-06 10:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f7190f0e55a8f5a2fb50f25118a524c9 SHA-1: ec596bb0b48e9d4b048d6f02d16af9b567b4fc2a SHA-256: b200022ab19977a649c0a8da0cdedde59d3bd4cb86cc31d95dfe0817fd6477dd
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 0.9998

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://synerhu.ru/pbw?utm_term=10+ejercicios+de+division+de+fracciones+algebraicas+resueltos PDF link annotation
    • https://vugaxedugu.weebly.com/uploads/1/3/5/9/135971543/sofufuzanetokoxeb.pdfIn PDF document text
    • https://xotufidew.weebly.com/uploads/1/3/1/8/131856134/40c38f8.pdfIn PDF document text
    • https://gufurokis.weebly.com/uploads/1/3/1/4/131453316/letukuwuwufe-nesuxopop-majujababu-zosifuduro.pdfIn PDF document text
    • https://xevududugomiti.weebly.com/uploads/1/3/4/6/134633411/tuxam-xizanezud-teledoxat.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/nojalugojeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_606dfac745068.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/9249128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fdd2ac5d8640.pdfIn PDF document text
    • https://tiseparalav.weebly.com/uploads/1/3/4/7/134735838/zewobexu.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/42ccf34e-b896-42ce-9c72-e99710ed8843/how_much_human_trafficking_in_the_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51c2b2f-fc32-41fb-94b0-4f914b497ecd/51667429830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f8a6e7-0d4a-49b2-8499-401a143212dc/libro_de_cancion_de_hielo_y_fuego_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d74718-21d2-4b00-8343-eb183d335676/tudelakivutofetug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9e3def-4b4b-4eea-865c-146c5af799e2/cuenta_conmigo_pelicula_completa_online_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9622a33-50ba-44cf-9a9d-67b17b6aa53a/sketchup_make_desktop_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac541fd-2ff4-4ac7-8a02-c94602869586/sony_vegas_pro_crack_download_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8973c34f-a33d-4435-9ae4-a9bfedd74dd0/vasurifurer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a951d9e8-0a84-4591-b596-52bccb15356d/99705418368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d782d765-36b6-483a-8d60-bfe056010572/maze_runner_last_movie_cast.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5564 bytes
SHA-256: 2600d06f40ec5ffec016a8b035530a9ba0b2e4bcd722112798007fcaca434071
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 12280 bytes
SHA-256: 7c320224fcee5556b1160cb552888c6a3917769b089bc39e785458e723e7610a