Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e21515a0710ba3…

MALICIOUS

PDF

72.7 KB Created: 2021-02-17 00:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d478d7c892ff1b8099b47693fb0f309 SHA-1: d8db25ef30fa5236ceaf1800e6df4c7bb2b08988 SHA-256: 37e21515a0710ba3aaa2b9d82053f37d167c458d7d03c507b84728d3842b6f44
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell T1553.005 Security Software Installation

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains instructions to disable security software and execute commands via copy-pasting into a shell, indicating a user execution lure. The presence of external links, including one to 'leonvi.ru', suggests it may be part of a phishing or malware distribution campaign.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://leonvi.ru/123?utm_term=microsoft+office+excel+2013+activation+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482402/normal_601f77bac538c.pdfIn PDF document text
    • https://bafibosu.weebly.com/uploads/1/3/0/7/130738803/dokugibod_fagevedopaje_nejujo.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/vujazamurit-nulodezon-vuporikipemif-gupalowidapo.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/iUjbdje/gagasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5ff3e4d45bbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_600d29d9acd30.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/ggcsajg/24197774478.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/dufujiti.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/vinivuxo/android_background_color_picker.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/remoxaduf.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/22368180541.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/circular_motion_and_centripetal_force_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/mubexugimumomoxuruk.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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 5664 bytes
SHA-256: acaffe09e3ca04cd9ac657498b8b3fdec55c3636aa072102555e46f0bb8221af
font_01_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 13028 bytes
SHA-256: bba1eac7b930c776799cde2dbd56a3d957baa4c3c0e19d4b615c9d98b9af7d8e

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