Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d31ee1f07e8a989…

MALICIOUS

PDF

81.5 KB Created: 2021-03-19 12:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bdacde7dcc19d2c98b2d278bd4bf4015 SHA-1: da7ee40f6076c24e04889a7d54eb431fb97b33f2 SHA-256: 1d31ee1f07e8a9897302437c09480e95bbb3d626cbc99eaae547043893953315
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 0.9998

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://pelibifir.ru/wix?keyword=the+crow+and+the+pitcher+moral PDF link annotation
    • http://segaruzobuguses.scienceontheweb.net/pibovunov.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jjhb0gj/66347203672.pdfIn PDF document text
    • http://fazurusitu.getenjoyment.net/suwajolunuveji.pdfIn PDF document text
    • http://iqecoportal.ru/118270558873yd8r.pdfIn PDF document text
    • http://paganel.world/el_reino_de_este_mundo0pl4a.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/jadukajuronagud.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/oHijzOH/excursiones_cruceros_mediterraneo.pdfIn PDF document text
    • http://savadaqwe.space/adobe_premiere_pro_cc_2017_free_download_softonic29mng.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/vudefesuwisamedufi.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/how_long_should_i_charge_airsoft_battery.pdfIn PDF document text
    • http://keto-s1.com/abc_of_english_literature_book8h3fu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luregaw.onlinewebshop.net/administrative_management_4th_edition_free_download.pdfIn PDF document text
    • http://fajegefifozibe.rf.gd/62523356811.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/9347625484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd2d0e1-f8a2-4d7c-b459-8c2d7e629731/meade_autostar_497_reset.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/jodixav.pdfIn PDF document text
    • http://bajolufek.rf.gd/algebra_1_textbook_mcgraw_hill_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b831782-23f9-4790-9e28-d7552e360989/interior_design_classes_online_free.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_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 5176 bytes
SHA-256: 8c09c616cddd265e92a8b092090512157e153b6ae3b465efa969f835161f6242
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 11240 bytes
SHA-256: 7332cc10e360170f15680c100e67c6b74ef44d077cc320b60aa2c655124efc93

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