Malicious PDF — malware analysis report

Static analysis result for SHA-256 970214920edd2299…

MALICIOUS

PDF

79.1 KB Created: 2021-06-11 01:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a0528fc02c873e91f206c9dde6de6fb SHA-1: 1531b78aa3ce8ccaa112a7527baeadcaa61e4901 SHA-256: 970214920edd2299093a051ea35bf8b99ec486563cbd1c6e6a048542548d8e72
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 0.9990

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://pistant.ru/pbw?utm_term=contemporary+bayesian+econometrics+and+statistics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fdb3d6e152ed.pdfIn PDF document text
    • https://rurirenaw.weebly.com/uploads/1/3/4/6/134652156/didugonavivuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393349/normal_5ff6d32791249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5feed4239f0e6.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/6857503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5fd636c510b55.pdfIn PDF document text
    • https://renobulog.weebly.com/uploads/1/3/4/4/134464004/mewubetiren_kapegugid_munod_bowidazepugun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6019b9b92493c.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/1861083.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewalar.pbworks.com/f/42536115439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38741df8-e78c-4fcc-b34f-d27906014e8a/38056532502.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/test_de_raven_escala_general_laminas.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/getemivejeke.pdfIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/145030419/30683539893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4150d60-57a0-4ca4-ad95-b3854ddb9a71/xatetolupagesilirijiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ef6302-d069-405d-af16-77fc5f7a09f9/what_do_guided_reading_levels_mean.pdfIn PDF document text
    • http://vamafob.pbworks.com/f/85364528914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a7395d-d0f5-41e6-b808-eeca444ce5fe/the_girl_with_the_dragon_tattoo_sequel_book.pdfIn PDF document text
    • http://fetinaduv.pbworks.com/f/gilegob.pdfIn PDF document text
    • http://devopiporo.pbworks.com/f/human_anatomy_for_artists_the_elements_of_form_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02aecbe0-f9ed-4ce3-9d61-8ef8a8151287/probability_theory_all_formulas.pdfIn PDF document text
    • http://nitezug.pbworks.com/w/file/fetch/144893910/ritimoweded.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/xaratimexoripesufajanuru.pdfIn PDF document text
    • http://metukamef.pbworks.com/f/voiced_and_unvoiced_consonants_in_english.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/zepuzuwogetunenari.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_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 5336 bytes
SHA-256: 446dbf18410a8f534a4535049d51913d1f21887ff5514d20d16ac24a9836b42f
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10824 bytes
SHA-256: e5a596d93b4494c688c57801c14b61e6481d4a6dd3e27fe66c120c827eefa0f3

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