Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bb93e003f53b05…

MALICIOUS

PDF

88.3 KB Created: 2021-06-07 18:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b8b83145b595d6b5c24f11f4bfc4b1e3 SHA-1: 6ec3854fb193d603d0004da5892c262eb246761f SHA-256: a6bb93e003f53b0576f8a708ab65dfd2d218ca92751337f2dad4c385833ad805
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 numerous embedded links, with one pointing to a suspicious URL on 'catamma.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates that the document is designed to host many links on disposable domains, likely to obscure the true malicious destination.

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://catamma.ru/wb?keyword=features%20of%20constitution%20of%20nepal%202072%20in%20nepali%20language PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdeab9ec-822a-46f1-9030-948e84eb47bf/batuvakikubufu.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144594702/catch_me_if_you_can_musical_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4e9b57-5cb0-44cf-8814-78cf22a9ab21/49973912707.pdfIn PDF document text
    • http://zotugon.pbworks.com/w/file/fetch/144637404/is_coleman_a_good_brand_for_tents.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/libro_de_nanda_nic_noc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d358f7e5-c419-46c7-b148-fbef80a52839/nonaresewadanid.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144425532/our_origins_4th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825bf07e-42fe-42a7-8452-1bb7feb4b36d/27268585910.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144659367/understanding_your_college_experience_2nd_edition_hcc.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144534222/jafifibapodujagemexesusix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bb4474-a0f9-446d-8174-1ce3a4a84d3c/6416864531.pdfIn PDF document text
    • http://mutoteja.pbworks.com/f/como_poner_emojis_de_iphone_en_android_sin_aplicaciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066736d8-08d7-4f7b-b01f-990445698bfc/crochet_patterns_for_scarves_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2385e30-c244-4820-a7d5-fd6dd8087438/63554749846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a57899-6c51-49ab-ade9-61785bddc968/goraz.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/14754045554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fbd229-654a-490f-b754-fd4dd4dd0602/maytag_gemini_double_oven_top_heating_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b343a51b-bcd2-4d54-aad7-7f5f3ca482fe/2733712768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0cf1a3-56b9-4a8a-baf5-5f7f7d5a0e65/xomawudunajuxekogigazif.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_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 5492 bytes
SHA-256: 6abadbc884499ef62ac9c92ba86d23823ddf1156407fd98c5bf776bc792fbd00
font_01_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 11028 bytes
SHA-256: 9b2386dc0b894092fc0d7219cf95db03653e3613b25cffb1925cc76a3ab53962
font_02_sfnt_off000142b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 3936 bytes
SHA-256: 1b2c97b0f5ab26a932a102049aad3ffd56e42db4ac080ea03c67c8f4f454a4e9