Malicious PDF — malware analysis report

Static analysis result for SHA-256 f187f3427ab652be…

MALICIOUS

PDF

76.7 KB Created: 2021-05-10 04:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e4e48fff1cd6e0facd2e7c7008c493a8 SHA-1: 53546a0aeaea3902207d8f8ed099a1df5f5c357c SHA-256: f187f3427ab652be1887a50a3a0dedf80621a94ef5a1ff0ef751eab07a1cc19f
186 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 0.9997

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=how+can+i+practice+the+presence+of+god PDF link annotation
    • https://cdn.sqhk.co/molivovuki/oIjalSm/atif_aslam_old_songs_unplugged_download_mp3.pdfIn PDF document text
    • http://xazapefunel.getenjoyment.net/82737614731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_603340f79bc68.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/02Sjbgc/colour_wheel_app_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6037ca8e9153d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fd702a01f4c3.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/coFIggl/to_do_list_free_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/ahjgg5l/74728638180.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/ledaxagire_guleriz.pdfIn PDF document text
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/eb16367.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/wusula.pdfIn PDF document text
    • https://likiroji.weebly.com/uploads/1/3/4/5/134526819/visufopupiwig.pdfIn PDF document text
    • https://cdn.sqhk.co/wefadegese/KibBiaV/bukunmi_oluwashina_photos.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/anemias_hemoliticas_inmunes.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/2351608.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/pezutafetem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_b8b3ed9c59a546e7b767419751357f4d.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_e808a59586424e8cac65e2462e73c05e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6240886-8e3b-4c9c-8480-872d01250252/free_singular_and_plural_nouns_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1513c9b-16d8-4449-8d3a-2734f96de63d/tefemosexuxasepiwafu.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_68744bebe49446b49346c314a7b5bca0.pdf?index=trueIn 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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5440 bytes
SHA-256: 40dc02224ba6a2367b66991173642a749552601e989cf53e90849db9b3885180
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 11000 bytes
SHA-256: 2f23d2d272b4956be5fed737ae932342992a80a1115fec007764a21878321b26

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