Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb51cf0f6e80e048…

MALICIOUS

PDF

79.2 KB Created: 2021-04-12 03:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a9e402b9acc86a22bb68758be51e57d SHA-1: e1e6a6d35e97fddaced54c1c0210f54d839a7bcc SHA-256: cb51cf0f6e80e048f0027d2b57c057844d401606b2c13af8daa342ad7c7d8168
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=are+eco+drive+watches+good PDF link annotation
    • https://cdn.sqhk.co/xuvisisitinu/dhhHtyy/troll_face_quest_video_games_2_level_9.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/2899167.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/hap7hgN/juegos_de_dead_paradise_5.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/5435417.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/6hgXwi9/black_library_audio_of_the_month.pdfIn PDF document text
    • https://tolazekujulom.weebly.com/uploads/1/3/4/6/134668849/wikafidagavosipobax.pdfIn PDF document text
    • https://navadajedu.weebly.com/uploads/1/3/4/6/134614390/6653222.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/lixovakogadazok.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/Hicgigi/smart_goals_definition_measurable.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/8ada77.pdfIn PDF document text
    • https://zogosozel.weebly.com/uploads/1/3/1/4/131406999/9345285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_6568d6b299c64c33b08bb987d9371e63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a5b605-8cf4-490f-98a1-ec5d030fddd0/how_to_fix_acer_chromebook_black_screen.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_4d0fe14997d94035abc0784dc7873890.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_d01f20eaba524187a96b06d415882b81.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_da229453032d410fb7b90057ce921e2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcad9d65-d7e1-4c30-827d-5ad4940be150/united_colors_of_benetton_shoes_online_shopping_in_india.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_6fa53b7f648c40659b60132dbc7251ef.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_754d9b2ab5a240a2b18de72733c32d89.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_c004a98e93b246198d7f34aba71c5aa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b15742-1381-4c51-b1ef-deacbcac9e9b/fundamentals_of_pathology_2020.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_8c50f8d7814e4c168d7e606543901727.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b703fb-84b1-48b9-8911-9814b83047c6/xerani.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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 5308 bytes
SHA-256: 893390a3fba393d4b509b7b869a47b50cf7051ea07d0103376e588be252c73cd
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 10928 bytes
SHA-256: 2126b3db1b173193995029f8536d0e89122c98df0bed79b008bb81ce7e059831