Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed81cd1986f2e19c…

MALICIOUS

PDF

92.1 KB Created: 2021-03-30 20:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b870ff28c331950af0b11dc64eeff9b4 SHA-1: 190be7c3a2c275a5cd13739de0c8ce141b9b5cd1 SHA-256: ed81cd1986f2e19c97da29d927925200014c9524e0b89e311d91b18797fee97d
134 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. 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 0.9997

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 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://botokaw.ru/strik?utm_term=accounting+terms+and+definitions PDF link annotation
    • http://rekijiwowak.scienceontheweb.net/cambridge_ielts_9_reading_test_2.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/K4zh5gg/70599483091.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/DgiJgej/kikuxisipijapalesezab.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/idWhdQW/61152934796.pdfIn PDF document text
    • http://mikrotikwizard.com/coso_framework_stands_formod6z.pdfIn PDF document text
    • http://vazaferexadamaf.22web.org/91032132423.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/doxatelobujanumeneragibub.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/ihNGWgd/jovidijuxulazobemopuki.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/58209112625.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/80370306646.pdfIn PDF document text
    • http://mugedly.xyz/how_to_type_into_a_file_and_save_itgxsk7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanugifop.atwebpages.com/2020_karnataka_assembly_election_results.pdfIn PDF document text
    • http://litorow.myartsonline.com/cub_scout_bowling_pins_pollard.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_0a9d6527d284447486994f9bc92a944d.pdf?index=trueIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/bihar_school_of_yoga_books_download.pdfIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_31f92bb292464772bf3d5c5cd47b5866.pdf?index=trueIn PDF document text
    • http://nufewaruxemo.epizy.com/canonical_form_in_pde.pdfIn PDF document text
    • http://wibiteripu.epizy.com/sociological_perspective_on_religion.pdfIn PDF document text
    • http://sikofus.epizy.com/best_online_coding_platform_for_beginners.pdfIn PDF document text
    • https://0b902d11-d057-4dfc-bffd-bcb57e9ba729.filesusr.com/ugd/696b8a_845a1316c6f74ba7af622a2b3660d83c.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 5300 bytes
SHA-256: 3fdcf9dcbcdbb86fb0bf53cb2ca3a1d16faad657b1d16de89f5084f0284ea95c
font_01_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 11200 bytes
SHA-256: 7f0c9ebd1497af21b7fbf496140f8398f9d06dc010d9fd892e1b1d5d70481821

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