Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aff05b8496590de…

MALICIOUS

PDF

76.8 KB Created: 2021-06-11 04:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35567b79fbc24b9bdaecc973cfb9031a SHA-1: 9edc7084f510698779445e8f5044e9586632605a SHA-256: 4aff05b8496590de121e1d671fc332f0cc721dab35a9f76797d0d2fdc9c7d004
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 0.9991

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://philabc.ru/pbw?utm_term=true+skate+all+maps+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391899/normal_604b849021698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_6007a537b822c.pdfIn PDF document text
    • https://tefewijinoxo.weebly.com/uploads/1/3/4/8/134881123/5777322.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/gagasuzete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_5fd7748d6962d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_600d5c76d3f33.pdfIn PDF document text
    • https://bilewemebit.weebly.com/uploads/1/3/5/9/135964156/koloxujederube_pigatigonenebeg_gijuwerinaget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_604a578eb9e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_60c28b91b4015.pdfIn PDF document text
    • https://duxezixupedad.weebly.com/uploads/1/3/4/0/134095883/ferew_bolizudikowu_tomawebisavogaz_gagijipetazirum.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/gemuvojifugut-tukukapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421770/normal_5ffaaf746386e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4428334/normal_60b1c5c739ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_602982df42de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fe1146171b6e.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/3445f4ca-a1af-42f8-a581-c8da10f62979/dilexomukabusepuleji.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144627693/gizmo_density_laboratory_assessment_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc9c981-80be-401e-a3cf-526555ffaa28/zetawiwigakak.pdfIn PDF document text
    • http://lutagunis.pbworks.com/f/xojevitirutamumapamo.pdfIn PDF document text
    • http://murenet.pbworks.com/w/file/fetch/144663117/how_do_i_reset_my_samsung_refrigerator_filter.pdfIn PDF document text
    • http://joromonepa.pbworks.com/f/ave_maria_bach_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b845e405-a3e8-4d9c-b9cf-e984e3ca59c6/compare_apple_and_orange_essay.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/computer_hacking_tricks_in_urdu_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d00072f-097f-4f3e-8749-63fde3981baa/why_do_fridges_leak_water_inside.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d7dde6-3ed1-4c83-a3e7-246b57a317ab/oldest_childrens_bookstore_in_america.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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5208 bytes
SHA-256: a5ff627de38612069179920ec11e5b3fc0ba8015cf0647bd07c416e64568e6d7
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10888 bytes
SHA-256: 4823e212c997012fef35bd63b242282a0de63e5bbe78e71f3ccedbc6e0d18754