Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93467383b808a1b…

MALICIOUS

PDF

73.3 KB Created: 2020-11-10 12:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e24f08bbd4ec77c26ecba9bef02e91cf SHA-1: c60b8728995812eeed2361d1c0e83306cc690eb6 SHA-256: c93467383b808a1b86c57f216804af8c7f96b2ff9578b2f4cbad7969085af3f9
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=words+starting+with+done In PDF document text
    • https://posexabilibo.weebly.com/uploads/1/3/4/3/134350455/3d1e0f87d084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f9cdf23118e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f92643d6e103.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/kinotige.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.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/fcda1215-3f99-4773-8631-3c30b651c644/45850487464.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/wasgij_puzzles_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5b6919-5d82-45e9-8837-36c4e001374a/under_the_tuscan_sun_book.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/occurrence_code_34.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf46fd2-fd16-461a-9cac-c07f761e863b/5225927568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c59514-78e1-4d3f-8bbd-527baebe2eaf/ferevuponorovuposa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c73c26-40a9-4a7c-a65f-0fefc37dd98c/chantillonnage_seconde_exercices_co.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/cbse_class_11_biology_practical_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/tommy_timmy_complaints.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/malizibasirufazasujawa.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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 5160 bytes
SHA-256: a583318f0f90d60cf16d791eef658e172e16c55d9d26fffc0032011a89a00582
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 12360 bytes
SHA-256: 8a578ed3507b1d73102e2a41685c326ad3044a70ef9f5c7cebc0812f979da4a6

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