Malicious PDF — malware analysis report

Static analysis result for SHA-256 223870c5f0e25f9f…

MALICIOUS

PDF

93.1 KB Created: 2021-05-10 02:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 246b3c665e3435f5eed8722349adef22 SHA-1: b3087992699fa1d7625bfae6752b9b01e8ebe34c SHA-256: 223870c5f0e25f9f7a4813949d76f32de86cda8750cf6947c02fa1cabcf38da8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=ryobi+40v+battery+charger+specs PDF link annotation
    • http://xubatazu.22web.org/40826029158.pdfIn PDF document text
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/f7ef9.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/5336f2480e48.pdfIn PDF document text
    • http://kotonopiz.iblogger.org/sazibirabalonukepomiwufa.pdfIn PDF document text
    • http://fitademaluj.iblogger.org/economic_dictionary_english_russian.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/aplastic_anemia.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/3f166c.pdfIn PDF document text
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/poxesagajufomu-jugaxubid-turusizago-jarefiza.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/the_maze_runner_2_full_movie_download_in_isaidub.pdfIn PDF document text
    • http://banuduxirodeb.mypressonline.com/cbse_syllabus_for_class_12_biology.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/basubejul_zomum_wuresomalibo.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/where_to_donate_used_toys_nyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_25e6eef12a134c71b3032c49fc462edb.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_8d7426da6674420287d8884a2e5f92e1.pdf?index=trueIn PDF document text
    • http://topawod.epizy.com/mudemujubiwi.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/physical_science_notes_module_1.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_5041e05f8a15404b99aca25ac4efe9c9.pdf?index=trueIn PDF document text
    • http://zipituvopedisi.rf.gd/bose_companion_20_control_pod_fix.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_0ea4d141223f46728a09b8a75a9fc029.pdf?index=trueIn PDF document text
    • http://varupijijajeb.rf.gd/how_to_thank_a_board_member.pdfIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_6486602832364dbf818920acf4711d52.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_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 5704 bytes
SHA-256: edafc443fca3be5d2c1b6976961771c1a393212d5e476c53e5acdaf183923a12
font_01_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 11872 bytes
SHA-256: b3a4d9a4bd258ae23699cc17ac6a7927df363b74d1eb9bb0e047ec8b6c46054e