Malicious PDF — malware analysis report

Static analysis result for SHA-256 90aec355d642f6a7…

MALICIOUS

PDF

74.5 KB Created: 2021-06-04 19:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 284c4f575f16cf2b91c77f10b9f16f56 SHA-1: 10add15b46eddb12b47913e5380a3c093b9de3ca SHA-256: 90aec355d642f6a7b0ab30494d5db9f812e712f70eac2131d710a573320134b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be a deceptive lure related to academic answers. ClamAV and ML classifiers strongly indicate maliciousness, with the primary IOC being the URL 'https://soxebez.ru/123?utm_term=college+preparatory+mathematics+algebra+2+answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/123?utm_term=college+preparatory+mathematics+algebra+2+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379613/normal_603258786dba5.pdfIn PDF document text
    • https://lorivomewojesab.weebly.com/uploads/1/3/0/8/130813497/67c3c506f6b9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_6043371929208.pdfIn PDF document text
    • https://penosemoboz.weebly.com/uploads/1/3/2/3/132302809/sabodor.pdfIn PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/7889642.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380876/normal_60b13cc133c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_600dd349849db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_6009f7ba58e29.pdfIn PDF document text
    • https://jukekusam.weebly.com/uploads/1/3/4/6/134651272/6744262.pdfIn PDF document text
    • https://vunamesu.weebly.com/uploads/1/3/5/3/135324142/8514325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_602ae89a9e681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e8b5bc-ffc7-4fb4-9b97-1565acdc66a6/98442590023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1952f998-9817-4e65-abaa-ccbf4c3109b9/life_and_death_stephenie_meyer.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144417360/lenovo_google_account_bypass_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85599548-2991-4533-a057-0f975318dd48/google_play_store_apk_android_2_2.3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a50727-8cc4-4f1a-9ef8-11403d7246ef/how_to_use_my_keurig_mini.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144497064/75032685685.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144424734/gakudi.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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5720 bytes
SHA-256: 33c61d891ada51fc37c67e0ba1c751d068194e8b66ed38d7337db2464f2e581e
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10816 bytes
SHA-256: a480900e02cc7497d8371e559254bb16f46a5171d3478ba70efdbaa87938d8bc

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