Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e820298db99815a…

MALICIOUS

PDF

71.7 KB Created: 2021-03-15 02:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4aa5deedbed216305f281f156fa164ce SHA-1: 23101dd7767ade2c2077b7903c3b7286d9aa81c8 SHA-256: 0e820298db99815a5e366f42b4180e4537f732e2bc3ff8a31d20c3152bb4ea60
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 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=student+portal+dps+k12 PDF link annotation
    • https://cdn.sqhk.co/gixenako/aaifjge/41780941562.pdfIn PDF document text
    • https://xononegedu.weebly.com/uploads/1/3/0/7/130738921/8a2349.pdfIn PDF document text
    • https://bofonoge.weebly.com/uploads/1/3/5/3/135388944/725a75e8ee.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/wagevarofi.pdfIn PDF document text
    • https://rapaxexujimina.weebly.com/uploads/1/3/1/4/131454932/f78f6de2b9.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/zarovikobok.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/9w5Mg6B/84659951248.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/H3ZggXH/17291251625.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/cjighAi/musica_de_los_80_descargar_gratis_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/1P7OHje/android_photo_transfer_app_for_mac.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/xovajukoxin/gifuselafure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979a3eb8-e19e-49c0-9cc6-0ff763ee58b7/fodoxofiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d0565b-3a4f-4bcb-be8d-1a066b0ce680/big_short_investor_tesla.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/68088260684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87ae2bc-777a-41f3-8b39-ec9b3adbb739/john_truby_anatomy_of_story_review.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/bavumisaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cb201e-ad0f-4b5f-8b8f-964725a14174/microsoft_project_student_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721d91ff-15b8-49cc-93c9-420718af2b05/iso_9001_clause_8.2.3.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/59939413972.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 5304 bytes
SHA-256: 283a02dc61080e4558c8784e15e8f0caa02a6671551a6a3d15b8ee00d6e248c0
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 11264 bytes
SHA-256: 70f88ff57117cd781841560ffbb15cc18fccec324712bfdc0fa168698754372d

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