Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b774228d904f94…

MALICIOUS

PDF

85.3 KB Created: 2021-03-22 05:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 923f38452daf797bdbaea62777757246 SHA-1: 0e191aeaa530060afe4ed33bf69b33e2ee9e45f8 SHA-256: 18b774228d904f949e90f51da0ddfdfa39d943a7d6de5d09d3745954e7040b2b
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://resalured.ru/123?utm_term=metformin+850+mg+tablet PDF link annotation
    • http://tublitalia.space/artculo_432_de_la_constitucin_mexicana_25d35l7.pdfIn PDF document text
    • http://lakufakatoj.iblogger.org/pcr_product_purification_protocol.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/38874048225.pdfIn PDF document text
    • http://copyright-services-us.com/wepisepuputiwuwii0yx3.pdfIn PDF document text
    • http://motivawka.online/jadenjo7pw.pdfIn PDF document text
    • http://bettermoneytips.com/650913126451ja29.pdfIn PDF document text
    • https://cdn.sqhk.co/ketadasogob/iajievx/era_sospetto_in_inglese.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/92938147527.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/jib7jdq/love_feeling_ringtones_2020.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/20688444818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/63881091-4b08-4da0-88ee-764e8d7f1ff2/newest_harvest_moon_game_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3f610d-8519-4a61-a27c-df95179356dd/74654559944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c697a93-5748-4ae7-8640-acc57119dd3b/ridizebominironol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6721d1-7910-4e4b-9bfe-92df73b8ef85/what_is_angelus_prayer_all_about.pdfIn PDF document text
    • http://gibagefozilot.epizy.com/how_to.write_a_letter_of_intent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f12ef8d-43e7-40c2-81d6-e2d0bb25a73b/72437152484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d95eb7-8e03-4cd9-a9a8-f5f1c8c95c34/r12_to_r134a_conversion_fittings.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 5304 bytes
SHA-256: 5eef0580063c0d72aca29a991edd9d6a9144597af2c4326c9b91dbfad8367e58
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 13956 bytes
SHA-256: a5be5ae5652379204f63d8dd82ed060e9093a6e369d417be8c669fa6f7afd616
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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