Malicious PDF — malware analysis report

Static analysis result for SHA-256 693de9b08d83f072…

MALICIOUS

PDF

76.3 KB Created: 2021-03-15 17:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77d0655b48de7ba434f2809facad37d9 SHA-1: 0a594803a7d388d8fa25b789b55de1acd9b6fbf9 SHA-256: 693de9b08d83f0729d53ca1dc995e0f6879668ff223c07526f93ab6d64352709
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/strik?utm_term=contrato+de+arrendamiento+vivienda+bogota PDF link annotation
    • http://walkover.me/pafuvinasrv7i8.pdfIn PDF document text
    • http://oneitshop.pro/how_to_calculate_gdp_ppp_per_capitahj5n3.pdfIn PDF document text
    • http://dresdenpharma.ru/zawujedixanumuwosar625kh.pdfIn PDF document text
    • http://topvideo.design/how_to_set_time_casio_g_shock_547866muo.pdfIn PDF document text
    • http://autoupgrade.website/what_channel_is_cozi_tv_on_comcast_20189a613.pdfIn PDF document text
    • http://puxeguka.iblogger.org/6553395360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_5befb7efdcd74153b2c9d752dbbe088d.pdf?index=trueIn PDF document text
    • http://fanurumuge.epizy.com/kambal_katinig_worksheet_for_grade_3.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_1aa0169ddad74632bf94a0722747debf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba08e88-ce38-4235-b1b3-79c3fa85f0de/how_are_the_organisms_classified.pdfIn PDF document text
    • http://sepasuguviwowuk.epizy.com/regusefivotexugukulob.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_1b4c682254e440dcb12a6d1ef2bb166b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d7e9bf-585c-4798-9cf2-d9ff3e6e99a6/how_to_thread_a_necchi_supernova_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba01f7ab-a8b7-4d09-b701-968920d7b44f/nikon_f50_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37979a78-7709-47b1-93f8-806e1f3b0337/page_break_google_docs_mobile.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/96209694116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062f4e2e-a446-4f0e-97f6-7671a7bd61c4/97701941622.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/trastornos_alimentarios_unam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69942643-c1cc-4904-8b60-015e47962db9/68132117220.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/good_snacks_for_diabetics.pdfIn PDF document text
    • http://gegumapobok.rf.gd/zumigerelafojexuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5357eff6-acb8-44ab-8ab1-ca2d63c3026d/95732713770.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_b4bc70d4f580481d8590680ac0777072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde92e4d-a798-477e-9c9d-c75635eec88f/94674935953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc625ef-1263-4cc5-aada-5c831d2d9e81/nilanewufavojiwufurek.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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 5040 bytes
SHA-256: 36bf88ed760c4d438e940516be2c6ceb654c7efddb4ea6593b6b1cb8af6cb951
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 11808 bytes
SHA-256: 5f56e1a5a99a999b758c6e707d3035c2571d4ab2310c952d2e4256ffd21d876d