Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d5772a5441ed9a…

MALICIOUS

PDF

73.4 KB Created: 2021-04-01 02:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 086b73165f978db9f2c2d1eaeab4966a SHA-1: 8a44dcbd900efd294f9949a0ee438bd1122b433e SHA-256: 53d5772a5441ed9a7723f589cf6043b90fbd65536ec7827f963700f11d075c4e
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 0.9996

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://botokaw.ru/strik?utm_term=the+way+of+the+master+pdf PDF link annotation
    • http://muzoc.xyz/acrokeratosis_verruciformis_pathologyh3j7j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fd1c15ebe433.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_5fe949bec414c.pdfIn PDF document text
    • https://werukubafufu.weebly.com/uploads/1/3/4/0/134000234/puluxajavura.pdfIn PDF document text
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/garaliwijaxosefewo.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/occupational_health_and_safety_jobs_entry_level_salary.pdfIn PDF document text
    • http://italy50wow.pro/nowajeduwiwafafajikakib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_6040699eaa7ed.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/31340220433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_601e237cb538a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexefobixavater.myartsonline.com/29441405413.pdfIn PDF document text
    • http://gaxijejazaxedaj.epizy.com/bet365_poker_app.pdfIn PDF document text
    • http://zarixisulepu.rf.gd/relemutagemonofoxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0cf666-0cf9-47d5-8940-3cd6b2159cf5/difficult_conversations_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36e7376-8187-44b8-a23f-56b7b0155849/what_is_trx_fitness.pdfIn PDF document text
    • http://kisuvixoj.epizy.com/free_funeral_brochure_templates_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54acf068-7c7d-4a62-8072-c0c2f068d4fe/lycoming_o_360_a3a_parts_catalog.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/medicamentos_anticoagulantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c114a6-3114-4502-b961-065ec4260da5/amusement_park_coding_questions.pdfIn PDF document text
    • http://vaxuraribo.rf.gd/mozagenobusijarufugiduvib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de525b48-d67a-4a17-a364-576a37c99558/zarorolojewovu.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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 5392 bytes
SHA-256: 271d8200a2831dd2fccfda4e6ade3c723d32510662cff5f9e17078e8a22bbae2
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10868 bytes
SHA-256: 27c7e12f71351ad312c9dcba829f9c08dd688827649066bae74b247384e993dd

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