Malicious PDF — malware analysis report

Static analysis result for SHA-256 19267a8bf5e584a2…

MALICIOUS

PDF

67.8 KB Created: 2021-03-20 19:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c9a1f837a2e19a0be55f07825e1b30bf SHA-1: c5109cdf1802b28ee5264633de1d1f6c8c85875c SHA-256: 19267a8bf5e584a29b9f1a6bc420d0dd5f0ad4f129d8b315afda560ac2ea34b8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=plantronics+backbeat+go+810+instructions PDF link annotation
    • http://lenudes.com/mayday_movie_parents_guidevjdzp.pdfIn PDF document text
    • https://powipasime.weebly.com/uploads/1/3/4/7/134725879/valexupavitamexezem.pdfIn PDF document text
    • http://nominasacra.ru/95459887583rg4bt.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/zupis.pdfIn PDF document text
    • http://keepxufi.space/racing_car_game_3dpfk6k.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/masewafusutamunesupovisa89zds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_109ae7be04ce429b818e6330c4a939c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/curso_de_ingles_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/49611059224.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_310772e1e37744de8ccd12106b77135c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/windows_media_player_subtitles_plugin.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_5adbf7109e1949f785827244264bd737.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5a80ed-9555-4b1e-918a-4f2231b47aee/danby_4.4_mini_fridge_outdoor.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/how_to_clean_a_kitchenaid_convection_microwave.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_296048e8d6434154a8eda0a29019ae4f.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_ab132cd7ff7e4edf822ed11c2be38a2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c155169-8d33-47c8-a856-3aaa271943ab/45053358369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c400d4af-bb62-4eb9-9d48-595698a70f17/fishing_gear_freshwater.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/12962449799.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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 5560 bytes
SHA-256: da318dd351254e58a7f68c09d653582a1848e5923ef12d0eec0a5b2e9aaba103
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 11196 bytes
SHA-256: 11861319395c87e840fc3de654ba265b60ad07a73808b39318542edc572ba96f

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