Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b04c25ef8f41d9a…

MALICIOUS

PDF

86.6 KB Created: 2021-02-19 04:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b941712bc425f7ff889bb782075453d5 SHA-1: 208aa73167f55ebdff8b2a6ebd96b46dd3f07f87 SHA-256: 5b04c25ef8f41d9a6c7139f6d94dfebe2de5346111b9c7ea4fd4e1618962e76c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://leonvi.ru/strik?utm_term=lenguaje+corporal+masculino+manos+en+los+bolsillos PDF link annotation
    • http://timurberg.ru/kavetenorenlfw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd61e6d27475.pdfIn PDF document text
    • http://marketop.club/allegretto_vanhal_sheet_musicgos5f.pdfIn PDF document text
    • http://unreguezff.rest/699188724851c7j8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_6027376fdd522.pdfIn PDF document text
    • http://strahuemsya.info/harry_potter_dual_audio_full_movie_ddmcj0.pdfIn PDF document text
    • http://bu-markett.com/er_physician_assistant_salary_by_statet9yfg.pdfIn PDF document text
    • http://rmk4sale.xyz/bizikuwukokozeritojji84.pdfIn PDF document text
    • http://ru-1.casa/rental_receipt_format8r3yi.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/815d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fe7da6d567c1.pdfIn PDF document text
    • http://alifan.store/7672315388k9oj0.pdfIn PDF document text
    • http://sovetnik53.ru/68758940813sumo1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/cardio_fat_blast_workout_video_free.pdfIn PDF document text
    • http://jejuton.rf.gd/jetediza.pdfIn PDF document text
    • http://vodetajedeluz.epizy.com/filmora_project_templates.pdfIn PDF document text
    • http://fejusudoboriduf.rf.gd/posufosodogibozagaza.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/multiplication_worksheets_ks2_year_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 5412 bytes
SHA-256: 06405a1280d4f331dbd90a0cc80ce7f356e95e57577587c5558f555832e3b02c
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 11692 bytes
SHA-256: 00074fece57aec9a22278a42fb737a58e32779f9a1924aea7febee728657d526
font_02_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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