Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b5bc73c30ebaa1…

MALICIOUS

PDF

75.8 KB Created: 2021-06-07 04:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8db2fba1f84de2b3fef9392ffb5e1cf SHA-1: c7c3eb3e24a6a4c6e5c435d0f3ca9130d052aa9d SHA-256: b8b5bc73c30ebaa1f072002105046c3e2eefbfcfdbea9993de0d9da8a17a9269
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://garglob.ru/pbw?utm_term=best+way+to+study+for+mcat+psychology PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417030/normal_600534a3bb5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5fd62bf86671d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_5ffe4e2d66e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_603972862cf60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5fe91cc8c10ad.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/1acd1661-4ee1-40e4-8b67-b06f4ccd8344/ethics_for_the_information_age_7th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daecbffe-1976-4002-b066-dc4ab37309bb/87629172577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65192c6d-9992-47c0-af4d-6c870cf0e593/oster_blender_food_processor_parts.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144509223/17440637271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1938ae46-8616-46f1-b33b-dce567dfea40/que_significa_ser_escudero_de_dios.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/9432358441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71505af-9d11-4550-9944-9f350987ebe2/wowikubowogujigasezupu.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144761862/71388645085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44331b7e-e114-4fab-a654-dc297828a21e/mopoxoroketibekolarariwef.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144732024/mine_crypto_on_macbook_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6865109b-7671-41fe-876f-e66f08b9e5e8/fofoxolaronixoziran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ef8556-ab43-47c6-b519-4f3999a1d853/fupaforujadulewazajakez.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/27138321769.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/f/zesumu.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_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5812 bytes
SHA-256: f97feadaa753c0ff3b11ba33482ed833fcde27e8380f1f8305fc15bdd5a64cb0
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10520 bytes
SHA-256: 86c010ab786325827d80436af039ae41ee172e207024edeb8dbf3730beb75144

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