Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4af888b1775aaab…

MALICIOUS

PDF

82.0 KB Created: 2021-04-05 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d371405abac755e5499c522ae8c1f19 SHA-1: 9c96d87c01bd869c35f8267e2799d0f3f49b5c95 SHA-256: a4af888b1775aaab27f70332491971c3308edc0526b27fec39ffc3067e52cd94
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 0.9994

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://fokemale.ru/123?utm_term=man%2527+s+passion+for+flight+answer PDF link annotation
    • http://sdorovie-sustavi.xyz/election_2020_date_listesedc.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/easy_disney_piano_songs_free_sheet_musiczeevj.pdfIn PDF document text
    • http://presentinsta.site/12338056096fth57.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/xumuketidulik.pdfIn PDF document text
    • http://pay-order.info/retemulewibepesos2cc1.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/5180868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5fcd5fa11a8f2.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/dungeons_and_dragons_5e_players_handbook_color.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/zerexopabazoxutuvo.pdfIn PDF document text
    • http://edayafar.xyz/how_to_print_landscape_in_foxit_readerlp63f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fe5276b64317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408180/normal_5fe03b527d10f.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/lorofejoraxawugedi.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/juloxikogafelajizefolane.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/sugotid.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/sedentarismo_en_mexico_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_af39107907d0414d9288b8c0c07a5427.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0183aeba-2054-4c74-98f8-e3436a5f02b9/kefedimufotok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365ade4c-c7b7-4c82-b43b-509031c483fd/bosch_gcm12sd_dimensions.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_8c57807c61f041bdbf4151b35a2367ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d725a9-0298-4cfe-a39d-813f8f55985c/xazudazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2fc835-cc61-4e37-a0ba-4197c9df09c1/lajowefajuludi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16cf75bf-f5f7-4232-aaf6-1990d329b672/history_of_philosophy_of_science_journal.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_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 5296 bytes
SHA-256: 2357e726890976d66a2f621619363e6d2d91275a91703d469c18771d6fbefdb3
font_01_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 10892 bytes
SHA-256: 041bf954720c6a52a9ed9dd8a7b4bb944d9124e3072d3df89408a32bfacee512

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