Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b43cadb05d05ac…

MALICIOUS

PDF

83.1 KB Created: 2021-05-08 08:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2e4b5685a0b18bde5d538e3b9df472b1 SHA-1: 27d3bb4d67222899cb782cf9b5ab432ea3c8c5bc SHA-256: 69b43cadb05d05acda2c82d236f955e3a6cbaf8d2b4184b4bdda2c5b448beb2c
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains. The PDF's primary function appears to be a link farm, likely intended to redirect users to malicious or SEO-manipulated content. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=social+psychology+jobs+netherlands PDF link annotation
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/e55cf.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/kaledolokijes-jepefokub-sulodujotesiduj-nutuzugex.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/d281cd1b1.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/demetinudizi-zekusu-zofinakime.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/ctet_previous_year_question_paper_sanskrit.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/e1f588e.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/6124998.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/duwusovadasomob-dovonuto.pdfIn PDF document text
    • http://narawodosure.medianewsonline.com/nijuvun.pdfIn PDF document text
    • https://jazelufum.weebly.com/uploads/1/3/5/9/135965355/006d539.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/0fdbfeaa-0634-4368-98ec-193a70580512/samsung_un24h4000af_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9501b8b9-87ec-4e8d-b081-ba192c07e72e/epson_xp_6000_does_not_recognize_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c7178e-f779-4cbb-837f-b5b63cd4d05a/brother_mfc-9970cdw_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e71e231-630b-4cbd-9128-cb264870d900/the_indian_vegetarian_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937bce5e-63a5-4f84-9734-71e120f1ce6e/what_is_the_significance_of_aggregate_planning_from_management_perspective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106256de-7374-406c-b31d-d8b22a872b85/bibuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ee79d3-5733-4e13-ab25-c3769a26a50f/direction_of_shear_flow_in_beams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05658f55-b432-4268-8933-234f698185c4/rudevab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656b3eed-7f3e-4d61-af22-2ece39c61e74/what_symbols_represent_family.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd6e0f4-4ab1-4dc8-88af-3a4b62d91de6/bekazidotikax.pdfIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/5560194534.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_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 5756 bytes
SHA-256: 50e3025b8413fbe204b4c19ac2b6c85fa50ea99548062aadf250258da8c7a327
font_01_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 11124 bytes
SHA-256: 911efb0d901b9b8b81fe46d33f70b02aba5a2b1c66cd90f35ca1939e4750a450