Malicious PDF — malware analysis report

Static analysis result for SHA-256 709586236f39cbbb…

MALICIOUS

PDF

89.9 KB Created: 2020-11-21 04:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3475ed286e4cfd214e1b8f944a6ac297 SHA-1: 189651e4612d99816d31210ef2ec4e2548f056de SHA-256: 709586236f39cbbbe648e71e9263ed9643d0170af519c451dd2d54c0e7a91d62
246 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to phish for sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://traffset.ru/123?utm_term=ssh+tcp+udp+or+both PDF link annotation
    • https://xujajogasugoni.weebly.com/uploads/1/3/4/5/134514057/wumeregijatodoxuniba.pdfIn PDF document text
    • https://foziramud.weebly.com/uploads/1/3/4/5/134585073/65e95b8a1.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/lavikoluluvi-bugudevudurib.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/66dad5b4552c574.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/nuwuzedesimojaz.pdfIn PDF document text
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/21737a34.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/bunobu/puditopototirebiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fb8c2f-f60c-48e2-a362-e3dc1c9df8b9/gamesalad_pro_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72336164-617d-40fc-ac43-2f47f777db95/bidezora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cedb812-fa88-4b4e-87ee-57a5750c2a1e/wenesida.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/69487168293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d23ce06-ecf6-4b81-b8a9-7b927aa90dd6/xukagujib.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_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 5160 bytes
SHA-256: 9f192bc887da26310bc684f0defe636686dfde39c335c9639b3ef240714325a7
font_01_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 11468 bytes
SHA-256: ea1b5a9a11b43cdbe01ed619df32e40fdfc415cf1f202c27b7e4536ac99703fd

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