Malicious PDF — malware analysis report

Static analysis result for SHA-256 7434600699d32a11…

MALICIOUS

PDF

82.9 KB Created: 2021-04-03 02:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eec2c4df1d9bbd701eeb2cfb22115066 SHA-1: b2564350b61e36cb585dec75c8ea509a62886763 SHA-256: 7434600699d32a1106eca06f7dfb620d656fa2f08eb6b35acf22947cb6261458
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 0.9996

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 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://vilenefex.ru/wix?keyword=infinite+geometric+series+word+problems+worksheet PDF link annotation
    • http://bluebadgeform.com/buxupuvazalefokifplcwo.pdfIn PDF document text
    • http://rodigevofu.iblogger.org/wotitesozodurijuz.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/therapeutic_exercise_foundations_and_techniques_6th_edition_freeqcitk.pdfIn PDF document text
    • http://dezlice.ru/bubba_forrest_gump_shrimp_quote9dp7h.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_7cdf8f17d73045a082f3eeee3c14f60d.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_c8a321ba450b4ec0b2d9a1fe26901b3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0a9463-81c1-4969-acbc-1e5fea236998/kididelosajubew.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/sharp_microwave_oven_drawer_kb-6524ps.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_47c387ba640548f8b8157b5a22ac0134.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_96fc0e3441564547862840b1f6489136.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_54232e21974343f4b66e514981fb28d6.pdf?index=trueIn PDF document text
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_941a59c5b74d408b9bc5b0e91ba916fc.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c5a7610a92ce429a8720128024131bbf.pdf?index=trueIn PDF document text
    • http://xusemud.epizy.com/different_weather_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/vikefozupemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4ec7e1-8f5b-47a5-9ba5-d421d9a528ac/how_to_run_a_flea_market_booth.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/dexatisavininewatuduj.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/pisagore.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 3544 bytes
SHA-256: 17a73bc4db2da080495e63cda7a92e5ee819e8b6ad9c8d3632be2144031d83d5
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5592 bytes
SHA-256: 65d76e3d5bfbb94d374811dedd0070a226b346b9c306d86652cb5020cfe129d1
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 11364 bytes
SHA-256: d040b36047e91aac0e96b202b28ab600313a64033dd37e61b62366abf1bc8d3f
font_03_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16180 bytes
SHA-256: 5ae188495d5fb7a760fd669a2006c174a8d7cb2699aebbe26994338c80600501