Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bbe5eb7b65d7df…

MALICIOUS

PDF

71.0 KB Created: 2021-03-19 08:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f4eaca6e226b88f72903d4918c32691 SHA-1: 967d23f4c2bf11d76ba46fd782ad0319410dfc6d SHA-256: 39bbe5eb7b65d7df3a74b58302195ad97ccfaf4e1067e955f06e01e28481d221
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://golowaki.ru/123?utm_term=gaali+chirugaali+song++remix PDF link annotation
    • http://lnstagramverifiedsbadgeform.com/5533298009467y11.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/eyelash_extension_training_course_manchester.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jj5LVq4/minnesota_vikings_football_score_today.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/tijgfjg/deus_ex_golden_ticket_validate_permits.pdfIn PDF document text
    • http://tehnopolis.org/nirupozelaho6v.pdfIn PDF document text
    • https://cdn.sqhk.co/muxuzoxipopa/hfgfhjf/nabumanewefakoji.pdfIn PDF document text
    • http://naworigexoz.iblogger.org/rupivazunusek.pdfIn PDF document text
    • https://cdn.sqhk.co/bubesuzax/Thfhgij/latedol.pdfIn PDF document text
    • http://retamos.mygamesonline.org/access_control_list_configuration.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/dQijhgW/zara_kids_shoes_size_chart.pdfIn PDF document text
    • http://lotobajigufar.mywebcommunity.org/buwoxepuxegakajop.pdfIn PDF document text
    • http://gufutaca3.xyz/bahubali_2_movie_in_telugu_720pg9g97.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/e4863b9c-3bfd-4ce4-a285-f3949177e45d/top_paw_double_door_crate_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/13069208475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed06045a-4f31-46ad-9ef2-30ec5183af05/vosujizevewegulem.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/plato_five_dialogues_sparknotes_apology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ed9308-3b1f-4970-ad14-f62db21cb1b0/94687416565.pdfIn PDF document text
    • http://povuputuk.epizy.com/66407978112.pdfIn PDF document text
    • http://jemileti.atwebpages.com/36104724611.pdfIn PDF document text
    • http://fozeworot.rf.gd/aprendizagem_baseada_em_problemas.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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 5312 bytes
SHA-256: 166c2d0089e93f50be8fd453d1a63766301d6e13b9b058b680acaaf1d8276cce
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 9872 bytes
SHA-256: 4094dc5abe2cadade8a1982a0561afed105f8d5bc006d04c072ca92a5f99bfad

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