Malicious PDF — malware analysis report

Static analysis result for SHA-256 62381f7f4ef30b23…

MALICIOUS

PDF

80.7 KB Created: 2021-03-30 13:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e82221ee342ccae28118814445804fea SHA-1: 1da6a99c2cd680921ba0c90f5eace4a785825087 SHA-256: 62381f7f4ef30b236d54756768cd07e71d747ed9c0c2086a8dae012191e91ff5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=my+hat+it+has+three+corners+lyrics+in+german PDF link annotation
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/23f042aee16.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/cyberpunk_2077_review_pc_performance.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/anemia_fanconi_adalah.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/handbook_of_space_astronomy_and_astrophysics.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/burger_king_application_form.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/kenekipi.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/0fd105b030b.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/advanced_mathematics_precalculus_teachers_edition.pdfIn PDF document text
    • https://beginuvemosuso.weebly.com/uploads/1/3/4/6/134699988/2463371.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/xewinawasuk_xuxigiredadov_jebizozewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/meade_autostar_495_497_difference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3ef033-1d46-4168-b416-0bc73153670e/4764196919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e1e35b-e4c1-47a7-8046-4bec5bcb1c1f/cutnell_and_johnson_physics_8th_edition.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/forgotten_realms_series_order.pdfIn PDF document text
    • http://bugamaxu.rf.gd/48425363736.pdfIn PDF document text
    • http://jujuletofu.onlinewebshop.net/89698726448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb60360-3df5-45ef-8ce2-de87aa9039f9/bands_of_mourning_hoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55eff592-f922-415e-8cc3-8d1d8f41d919/epson_workforce_7510_printer.pdfIn PDF document text
    • http://poluwusafoge.epizy.com/32261878981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb3b413-601a-45ba-991d-941251f55625/88020871200.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/what_is_the_best_medication_for_cellulitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec26864-8362-4bda-9cf9-408c51042198/94352655484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efe2a7c-6332-4f2f-875a-ff16773d709f/laxebejamaviverolekuveg.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_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 5320 bytes
SHA-256: 2a4b99d500dc641bc45f63b59b0ae98e0ad37a317978a0f06eadbeae173db59b
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 13016 bytes
SHA-256: 8cfc613116d36be2680c3949f3c6d35d0ab7324759fc80cc9edf9b2327c11c4c