Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39338b556bdd5a3…

MALICIOUS

PDF

84.4 KB Created: 2021-05-14 14:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89d299f2de72d2600f549760b50fab10 SHA-1: dc8d0603bfd1e906cb3fadb076ff58a2e1b3d422 SHA-256: d39338b556bdd5a38b7fb6d30bed1f97cba93fc5b8d9cbbaa6eb3308cb3ae1ed
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 0.9997

Heuristics 5

  • 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.
  • 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=how+to+stack+maytag+front+load+washer+and+dryer PDF link annotation
    • http://gomijojupi.iblogger.org/68584976551.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/dibenzalacetone_synthesis_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/lolitubafo/ihatsQt/96846169807.pdfIn PDF document text
    • http://ufenmac.com/written_driving_test_study_guide_washington8l5n3.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/lekorerizugil7rnw6.pdfIn PDF document text
    • http://uspeh.icu/tujedudc45mo.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/jecghdC/arabic_quran_teacher_near_me.pdfIn PDF document text
    • http://good-production17.site/gigusiwagemuf4g5u.pdfIn PDF document text
    • http://spiritstudio.ru/45147230727xnurt.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/kakufetafobsfopy.pdfIn PDF document text
    • http://gromstroy.com/what_is_normal_development_for_18_month_oldx5472.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/aprendizaje_cooperativo_libro.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/curso_frances_para_principiantes.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/logitech_m325_driver_windows_7_64.pdfIn PDF document text
    • http://tiledevaw.22web.org/66398615805.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://uploads.strikinglycdn.com/files/0231fbdd-03ac-49ba-9504-3a19af95f28f/webuzakeluxevewamud.pdfIn PDF document text
    • http://gudukiderunusu.myartsonline.com/93544626843.pdfIn PDF document text
    • http://bixasejefo.rf.gd/building_construction_stages.pdfIn PDF document text
    • http://pexofapu.myartsonline.com/83481985780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1389f01-ffa6-436a-bc4b-869751ea6681/platos_republic_book_1.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 5396 bytes
SHA-256: b1b017875130af709a48d3f257ef0e9acc08e1337b8abfb38e2e0d495dff847d
font_01_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10768 bytes
SHA-256: 5785e1cfffe075f0016c8da26f3a53727f6508f7a0ca407efc914abbf5179e7b
font_02_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3