Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81055f86035eaee…

MALICIOUS

PDF

69.6 KB Created: 2021-04-24 04:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ce8611c81156b918f31b66c6c972a06 SHA-1: b11d8d983df99570d388dc389ef2d1da2f1fadc4 SHA-256: b81055f86035eaee76d76ae964b4e91a6a5248acd7a3023de5020a1dc0a1e09c
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 0.9997

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://crophysi.ru/strik?utm_term=plan+de+estudios+2011+primaria+quinto+grado+pdf PDF link annotation
    • http://uspehdnyaaxyz.xyz/dreamboxedit_7._258t1b.pdfIn PDF document text
    • http://sibixujuw.22web.org/85470126356.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/the_art_of_understanding_yourself.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/19738784576.pdfIn PDF document text
    • http://insta-sale.site/york_diamond_80_furnace_flame_sensors7yo2.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/telugu_calendar_2020_new_york.pdfIn PDF document text
    • http://vvd.bar/dijixizerorululamg0n0.pdfIn PDF document text
    • http://sesalon.xyz/5251278848442bd9.pdfIn PDF document text
    • http://sandiego-podcasts.com/tefariv6ggcw.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/hjjd5hj/jalinotijorakutikule.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/oRd4hgW/latest_android_tablets_under_15000.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/gX9Xhat/9_months_pregnant.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe13192-d12d-442f-b0ca-19e9f9c03afc/how_to_use_amazon_echo_dot_4th_generation.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/12763258025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55cfd2c-209e-42cd-9d0d-703ab6447046/dewewojepisukisoxokanumus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdfe6cc-73df-44b9-a2a7-4b720f536efb/vafonikudi.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/que_es_la_bailoterapia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538af37a-0b6b-4672-bfc2-733abba75b86/tiraxisijajonubesoxali.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/scope_of_work_template_for_it_projects.pdfIn PDF document text
    • http://somukagokololu.rf.gd/activated_charcoal_ice_cream_los_angeles.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 5812 bytes
SHA-256: 8b98eeb6239851272c5bed8e074e815fbe5ee461522c3f96b18b9367dd58314e
font_01_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 11352 bytes
SHA-256: 448e0bb03e2f30f4326acc8a4d6374fdc9d4ab0f17804e3564a3374ae7707208

Open this report in the interactive analyzer, or submit your own file for analysis.