Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b011da1f35783e…

MALICIOUS

PDF

105.3 KB Created: 2021-03-25 18:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9fd508baa19858a2b5bf942fedcd3023 SHA-1: 2babc0310546b95e9c207e3154b66f1fba84afd2 SHA-256: f9b011da1f35783e47cdad3f98190a8282c357594c17d6fe514958a55e0d37c6
216 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 brand-impersonation credential phishing. 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 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/wudosa.pdf.
  • 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://zajinet.ru/strik?utm_term=what+are+the+four+risk+management+model PDF link annotation
    • http://azorocheat1.xyz/chris_young_playlist_all_songsznbcs.pdfIn PDF document text
    • http://idealica-columbia.site/tipotafebotuxurubikaidu.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/wudosa.pdfIn PDF document text
    • http://reactivascotia2020.com/what_animals_are_symmetricaloftsf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6015898d0d105.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/a8c9900c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_5fc76208df01a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/how_to_gather_table_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ecf391-2898-4528-9e7e-0d4da30a4a51/rowegarokuparaxamo.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/gefuwetetagumapaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514939e4-ab54-4eef-b133-5ad6503e7e25/regisazidiroxuromezexufiz.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/mirerulukebowus.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/vuvepowizuwupobegerej.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/average_salary_for_geotechnical_engineers_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/top_best_football_games_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f3568e-1cca-4386-a105-4d3a7d5497a3/junji_ito_collection_souichi_voice_actor.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001529e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529E 5280 bytes
SHA-256: c3bf85e4fe6f50e22a82225122b75cea47cc2644e8921dcb2f59c3c25962e9d3
font_01_sfnt_off0001647c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647C 11084 bytes
SHA-256: 7abde826cf485d74b87c910ede984019adcb6bbf45b08992c8c3f0aaf88c3536
font_02_sfnt_off00018a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A28 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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