Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb2984731a09b87…

MALICIOUS

PDF

71.0 KB Created: 2021-04-02 04:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cf3af91e0e22907717013a6ea9108ab0 SHA-1: 24a70a1703cf42652f39506f3a756a1206bbd990 SHA-256: 8bb2984731a09b87496520aedf018effaaed7bdd2c93a7b2a41ad3cd80be740a
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple embedded URLs, one of which, https://seumenha.ru/award?keyword=caderno+de+caligrafia+pdf, is associated with a PDF_URI heuristic. The document body is heavily obfuscated, but the presence of URLs and the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=caderno+de+caligrafia+pdf PDF link annotation
    • http://witaxolexigabi.mywebcommunity.org/brick_masonry_design.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/jhibMOp/ritedorujulolejejap.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/13949081587.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/3m_medical_products_catalog.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/mRsidif/61194666624.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af656467-b1dc-45fd-91e1-df4bdeb85a04/nasasigujova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe6a8d1-64f3-48ee-bfb0-32dc66dc02fc/mvcc_business_office_email_address.pdfIn PDF document text
    • http://fimuwudefixolet.epizy.com/guia_ceneval_derecho_contestada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7711b86-d094-4bef-8636-0d9cc5d549fb/burezegufafedizeva.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/connected_mathematics_3_grade_7_online_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42b8d7e-3f02-43fa-af42-5e98ef9e4d0f/average_life_expectancy_of_a_homeless_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d8223f-29a7-4016-b56b-ed3fb50ff7ce/interior_designing_apps_free.pdfIn PDF document text
    • http://gexepitirunagu.rf.gd/geraz.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/tojojofufimopifuw.pdfIn PDF document text
    • http://kuxixatizoxop.epizy.com/chemiluminescence_western_blotting_technical_guide_and_protocols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7c2bdf-08f0-4f1d-a16d-e78c1629c381/nordictrack_x7i_reset_button.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/the_aversion_project.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_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 5048 bytes
SHA-256: c086caf6513b0eed2cda25d71032e563bc0681d0063ddcea5f7114dccfadf9b6
font_01_sfnt_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 13408 bytes
SHA-256: 456cc1c781487a39074fa55973b91ba5bbb11051300d6acbcdc8900799aab655

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