Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51bf5367d654286…

MALICIOUS

PDF

70.7 KB Created: 2020-12-18 07:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f49a9db3919931dc7e8f99fabe5231f3 SHA-1: 9d0b12477b0c9161b86aa5c43e048ef752d3aa78 SHA-256: a51bf5367d65428656d162000b1cae8a8cd19339ae005cb0029f94f472221229
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-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://traffnew.ru/123?utm_term=unit+for+turbidity PDF link annotation
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/gegema-lijogodutawu.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/jovusisom_mezetejakuje.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/munirakux.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/kabenoxi.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/kozusomotugug_kenuluxe_varuwitarimov_kuvixemas.pdfIn PDF document text
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/nibiguzesapexefaduf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc593df27a199023ad5232a/t/5fcad84c0814be4f73dce3b6/1607129165141/shelter_island_san_diego_restaurants_on_the_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02938cbd-d88e-4d61-874e-80848ab95c77/wiwojavur.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/amman_songs_ringtones_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b629affbf90a66e985ea/t/5fc1ab184e98326c024f2eae/1606527769354/the_spread_of_hellenistic_culture_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a9f41f-dcce-406a-b155-5f9607f24bbb/plano_para_leitura_da_bblia_em_6_meses.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/currencies_and_capitals_of_countries.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35e67cd1e280355e3f728/t/5fc554701972c46e3c4eff96/1606767744187/gta_san_andreas_apk_mod_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616c66a6-d822-4420-9a8d-9f650fde5302/relebanod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3b443e5c7695ca9ad1d73/t/5fd1f3d91693665fc7d5519d/1607594970808/nipurilamevoxox.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 4712 bytes
SHA-256: 7b2a687178f067b7fd475608c2e76b745668a2474e95942d87d84d3c8a75e0c8
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 10756 bytes
SHA-256: 13d30e06a6cf521671a5e9491bdc36e4c62b571a25a305e4aa4f25ebedb84987

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