Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d8575046d7fe07…

MALICIOUS

PDF

92.3 KB Created: 2021-03-26 09:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55afea0403ba2f1712daee1f41b18db3 SHA-1: 8d3cdce7d80ea2c69bbc7d1dd098d98c7a11cded SHA-256: d6d8575046d7fe076b47e5dc915e26bc4b39b7a009da7663ba89610489995c04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9919

Heuristics 5

  • 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.
  • 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://midufefew.ru/123?utm_term=guitar+fretboard+worksheet+pdf PDF link annotation
    • http://zifosazoniduve.22web.org/mudolafezolepupepezuxu.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/home_design_catalogue_free_download.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/domupuwev.pdfIn PDF document text
    • http://tukazijib.22web.org/java_full_video_tutorial_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371807/normal_5ffb959c97e13.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/tosepeni.pdfIn PDF document text
    • http://wumokejo.iblogger.org/30282012473.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/97712072080.pdfIn PDF document text
    • http://sutugolewajoz.22web.org/femtocell_technology_seminar_report_ppt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5feb4f67ef9fb.pdfIn PDF document text
    • http://zavupefedeba.22web.org/71562970279.pdfIn PDF document text
    • http://pojegan.22web.org/58905165349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_602eac2e578d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ffbde8a659e3.pdfIn PDF document text
    • http://bukanugizini.mygamesonline.org/f8_audit_and_assurance_notes.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/mitalegixugukadasodega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_605b7e3354ec9.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
    • http://nepumunu.rf.gd/b_tech_computer_science_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd8a670-cd5f-40ac-9864-6f26d948e822/how_to_do_digital_painting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83c8bd8-0eab-495d-8b91-12ce15c2e6df/what_is_the_best_jiu_jitsu_gi.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/what_age_is_coraline_book_appropriate_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa729a6-983c-41bb-8b21-87fc10c672f2/how_to_update_lowrance_elite_7_ti2.pdfIn PDF document text
    • http://nefaped.epizy.com/building_covalent_molecules_worksheet.pdfIn PDF document text
    • http://kinutumuzikuji.epizy.com/cask_of_amontillado_character_analysis_paper.pdfIn PDF document text
    • http://mewozukejos.rf.gd/restaurant_cassis_guide_du_routard.pdfIn PDF document text
    • http://wuselenefoz.rf.gd/valvoline_durablend_5w30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863d26b3-f55b-46af-8f3a-ac0969ec07f6/7535207429.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 5200 bytes
SHA-256: bad2dcf9b049b9c5e4f2a30a4afe39f1f576433df14a756407cd11e38b9a575e
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 10984 bytes
SHA-256: 826a60c39784f289103c7931a2eb4fd5749035b1fb91dc53d6e7a77bd90eb9a9
font_02_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 11624 bytes
SHA-256: 5ab6351d9ffe5101781d8f1f75a1bc52237aaa5948d792f97da0a89c25bbb9ad
font_03_sfnt_off0001531f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71