Malicious PDF — malware analysis report

Static analysis result for SHA-256 193658afcd3220a3…

MALICIOUS

PDF

77.6 KB Created: 2021-04-21 09:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb2128aa38c3c7d05f572ada439225ac SHA-1: ea4417d501f6ba596cf40d95b0b72e5d341782a0 SHA-256: 193658afcd3220a38976effe16d14d4760bc0a7a113b50f199941f30f5b5d6f1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the PDF's classification as a phishing trojan strongly suggest it is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=el+camino+del+artista+resumen PDF link annotation
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/6ef2a3dd56b355d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_6001106bc9a2f.pdfIn PDF document text
    • http://jupapopikok.22web.org/space_systems_engineering_online_course.pdfIn PDF document text
    • http://kesosobozu.iblogger.org/domaxesukel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_601d2f1f95620.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/b71e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_605d974d46d37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5ff087727ca71.pdfIn PDF document text
    • https://subisadorug.weebly.com/uploads/1/3/1/6/131637552/sotabumavadepum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nisoxow/tecumseh_10hp_snowblower_engine_spark_plug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ebac1f-ad45-4494-872b-ff8772893f44/what_is_the_catholic_church_mission_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9971f38b-b5ef-4c3a-ae69-63f1e886f325/shirley_jackson_the_haunting_of_hill_house_quotes.pdfIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_b5b13d40060349009606e749a89c7b40.pdf?index=trueIn PDF document text
    • http://kakapefetabol.rf.gd/abby_fine_reader_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df30222-c465-44aa-a4b0-a0ae8e9ec09e/is_tokyo_ghoul_re_on_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21136d2-7276-4738-80e4-54e188c66fea/zofadu.pdfIn PDF document text
    • http://derajina.rf.gd/biblia_de_estudio_pentecostal_editorial_vida.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_fb3f1993ee5a4c21a0496bb99ebb9072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b236231d-6382-4ad0-8185-813c2381c7ac/i_can_die_today_i_made_the_set_proud.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_6f019b12673d48119b5519f8a08938fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukiza/what_is_a_warzone.pdfIn PDF document text
    • http://mesesoriran.epizy.com/3830401405.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_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 5040 bytes
SHA-256: 9b2457af086c9f9939594ddb4d72b5c4ce01f0cee12bb1e5dccd9b0c457da08d
font_01_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 10324 bytes
SHA-256: 917382de05e4ff7b52edadea87d23ea9968ba768e0b4fe9cf17f10ac1c237b3e