Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47e43e715742fe8…

MALICIOUS

PDF

74.2 KB Created: 2021-04-16 06:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84486b1714f1b13a5d45471430aa2c14 SHA-1: 9d49337dfcf7455157e55a6215a7133d108148b4 SHA-256: f47e43e715742fe8e85a64b829c057dbc25b1f66af4d0c28ee71600cfb493e10
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 0.9997

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://mezovuduw.ru/strik?utm_term=oreck+xl+element+vacuum+reviews PDF link annotation
    • http://bumasujofoj.getenjoyment.net/98604999782.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/pawovogaxugavix.pdfIn PDF document text
    • http://buzobofojixez.iblogger.org/integral_calculus_cheat_sheet.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/dovikereluda_gokepuzagesig.pdfIn PDF document text
    • https://pidodogifir.weebly.com/uploads/1/3/1/3/131383649/4692210.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/similar_shapes_worksheet.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/captive_prince_short_stories.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/59661179873.pdfIn PDF document text
    • http://vemololuwejab.iblogger.org/72909500841.pdfIn PDF document text
    • http://vekowen.getenjoyment.net/arcgis_10._5.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/samsung_grand_prime_plus_4g_price_in_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_a2ebc2b4ed6b4135a57eeb50628d39da.pdf?index=trueIn PDF document text
    • http://sofibimibojas.myartsonline.com/general_anesthesia_procedure.pdfIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_4d53ab4f42d544e589213f35b1d03fa2.pdf?index=trueIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_2fa55642787b4624b916c22b29919b64.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_420c5f13b6fb459b8deb22c1c0be5a4d.pdf?index=trueIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/chapman_grammar_book_1_download.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_8a12a7759dce4504937d749397a72986.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/abituriyent_jurnali_3_2020.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_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 5256 bytes
SHA-256: 1ce00a907c3e7fb14784b5a3df63b3dab783423ba63a21cc9e253e58d53de2bf
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 11496 bytes
SHA-256: a7fb1d237b06f0d1e99299ece6a65cda76d31d78ba5fd959e70e1a009b351fc1

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