Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f9b00dd243c384…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 19:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22a131d256e24d3648d1f84c298e28c2 SHA-1: 5ad481374357ddec80dd958a3a508f7154ecd966 SHA-256: c3f9b00dd243c384ef801de43f7e8f2e64361617f671e2de1862f677ccaf5e72
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 0.9997

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 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://jacksth.ru/123?utm_term=addition+of+decimals+worksheets+for+grade+5 PDF link annotation
    • https://cdn.sqhk.co/vofemolat/nhiiejc/need_nails_done_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_604dd0473db79.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/jeogjEk/jofolitab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_6010147834762.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/jijgcC2/46049865029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupuxus/epidural_analgesia_for_labor_and_delivery.pdfIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_7c12e3abb0324e3382308f9de3cf4949.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/38466558142.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/bekhayali_lyrics_video_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/best_christmas_songs_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d25e7e3-d205-4d15-a44e-13dc33103518/fadiresudoto.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/jokezirafinegoziti.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/bejefubesovesokeni.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/access_2010_training_database_template.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_92edad901caf4e08b956172de13bef02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9b1aeb-c043-49dc-837e-8e141e405391/25135057593.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_d4c3f16dcdc54f6aa6f9692c11c52357.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_a10f7b4ce52249cc986a2e604a4d2f01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nimuwet/backup_drivers_windows_8_manually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a7a948-d5b7-4c63-ab38-fa0222cb960b/Life_Together_Fellowship_Throggs_Neck_Campus_East_Tremont_Avenue_The_Bronx_NY.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5704 bytes
SHA-256: b47b978b9cee1e95d1fb4d739125955dd53bef4815b24e0ec6ce8c4f6a074097
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 11000 bytes
SHA-256: 305cd0b0f08d3dc431a233acf58b1dbe187891f1da8c6d1050481953d2ba1f20

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