Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d1f5927396006c…

MALICIOUS

PDF

89.6 KB Created: 2021-05-09 14:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b837d4ee67a94412768234b1faf26c4c SHA-1: 545cf6d79e4736282148a5fe74ae3bba726d0b42 SHA-256: b7d1f5927396006c1c2ace819bdcf451687ee531d68751cfb977da4ab04abaeb
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an invoice-themed lure. 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 0.9996

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/strik?utm_term=todos+los+dioses+de+la+mitologia+griega+y+romana PDF link annotation
    • http://cuzinfo.ru/83495775407aoeba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420917/normal_5fe3bc82c08a7.pdfIn PDF document text
    • http://xitnet.fun/pdf_to_dwg_converter_zamzarfb6qw.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/fLiE9hh/angioedema_patient_information.pdfIn PDF document text
    • https://cdn.sqhk.co/rapedipular/gjdyih4/starfall_calendar_october_2018.pdfIn PDF document text
    • http://tells.fun/kexukitaxevezadf6704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_60062a95e6956.pdfIn PDF document text
    • http://lakuberik.mywebcommunity.org/ip_access_control_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_6060f9dfc0bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_604f402744a0a.pdfIn PDF document text
    • http://snapchat-alert.com/head_first_pmpyy7q7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fdb914531e9d.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/niwusawikudosugefewavikoo8jbt.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/eFLiclF/how_to_become_president_of_us_in_bitlife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_b0b14a97547e49b592e3139e5b48ed3c.pdf?index=trueIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_8b4bdd48aa1b47bb9e5489dc2219e304.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_9064ce58870c4ed29c170eb698df22d8.pdf?index=trueIn PDF document text
    • http://jasesazolaf.myartsonline.com/car_payment_receipt.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/baelo_claudia.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_23dcf28c05ee43878ef33a88d05e51b6.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_e54107cb5dd04149a13c17d4a58108e5.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_c3f3aaece2874e20bf3f5bea09fd1998.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_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 5196 bytes
SHA-256: b846019bdc16fa4bb4425c5efd91baf9aaece9a6a7381e4142b39123d2649435
font_01_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 11144 bytes
SHA-256: dd2c80101658f5de4ad581f21ece1d74211e78ce240b68f00f2f54112a60d83a

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