Malicious PDF — malware analysis report

Static analysis result for SHA-256 292a1dcc8685436d…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 00:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f95b95be5aad7e82fe6c3746bcc14540 SHA-1: 1a96c910caea4defc8bc74c5ac634964d222782b SHA-256: 292a1dcc8685436d8218bedaab5cb9fa0609539cf46137afb39119f70b19b8a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'xajibur.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to medical information, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/award?keyword=manejo+de+cetoacidosis+diabetica+y+estado+hiperosmolar+pdf PDF link annotation
    • https://cdn.sqhk.co/dakagugi/ieidhjM/dupinu.pdfIn PDF document text
    • http://mezazasakejel.iblogger.org/types_of_data_gathering_instrument.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/the_expanse_season_4_episode_10_wiki.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/annuity_due_example_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/hdCuBbi/32321662326.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/dasanap.pdfIn PDF document text
    • http://bosaboro.22web.org/kegorunigaketenizajan.pdfIn PDF document text
    • http://vekogevev.22web.org/abbyy_finereader_15_free.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/mawexedoxilixuvox.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/geYigjb/43989657388.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/pop_warner_forms_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/iaI6n3Q/78228962437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_f150ab7b2499448ab893435abb7f1749.pdf?index=trueIn PDF document text
    • http://widusop.atwebpages.com/control_systems_engineering_6th_edition_nise.pdfIn PDF document text
    • http://faganelatoke.epizy.com/tecumseh_tc300_repair_manual.pdfIn PDF document text
    • http://xomoter.rf.gd/7479421865.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_fe7cfc326aaf4bb596248edf0e7e1f2e.pdf?index=trueIn PDF document text
    • http://vutakeba.epizy.com/how_to_do_multiplication_fast.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_07f9882e30034c8d8ff60213d519d190.pdf?index=trueIn PDF document text
    • http://zukevajisuw.rf.gd/shout_isley_brothers_sheet_music.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_1cf10a3e7b09446da18f20cc27d50ed3.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/business_vocabulary_in_use_intermediate_book.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_5c67077d9574476faa37b17ffeea9584.pdf?index=trueIn 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_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 5716 bytes
SHA-256: 90dce838453a604fe796dc80f23fbb316c38d28eb9a5759692328b64e5cbe34c
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 12332 bytes
SHA-256: 38ec4cddfa8f31d6a5d872daf9e6f8a03aefce6be96f0b716b53e05bf5f0a525

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