Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4de6582dc9a8ae…

MALICIOUS

PDF

78.0 KB Created: 2021-06-06 16:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 939bcf3fdac7bf93f1f834c4d1008fd6 SHA-1: 72a66bf4fd3120fa3d3a742e50df864df6a6ce26 SHA-256: ed4de6582dc9a8ae8d41a082d3307336e44fef769462ca02f213c312bdc48b4b
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 0.9996

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://krisoc.ru/pbw?utm_term=sairat+zala+ji+video+song+download PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4486765/normal_60b2f72a8ac6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_600383e053cdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401976/normal_60007b216f929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fd5fccab8481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_6052a549299c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_606a7addc16fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_60ba846384aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_60b9c20db7ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_606a17428250b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5ff1ef6e6253e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_603b234f63eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_60515302492fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_6019d5784bc3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fd64cd2a6dc9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367912/normal_60b3b25eeee34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudotoxej.pbworks.com/f/how_to_speak_english_in_tamil.pdfIn PDF document text
    • http://kemuxin.pbworks.com/f/can_cant_must_mustnt_exercises_1_eso.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/13016575454.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144451776/nokia_flash_file_download_by_product_code.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144461721/34196609649.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144536391/tabla_music_tracks_free_download.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144458505/how_to_hack_in_counter_blox_2020.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_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 5376 bytes
SHA-256: 55f5d466aa8697c98bb424648871127921433f48b695f41eddbe99d938a78df5
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 10872 bytes
SHA-256: a39ebf42fa39cb5d1109c0171716b7780c315e82c9a4d4eb64e13d16d1815c85

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