Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ba476fa0cbf3a6…

MALICIOUS

PDF

77.6 KB Created: 2021-04-06 05:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0b6dee0aa90d15d2d4af0623245a3d2c SHA-1: 668c5e8b66c0898d167245842ddb7a127215ca20 SHA-256: 50ba476fa0cbf3a664ddc5696ae0f925b7962c916ab8ca76e7a0b4809615ef93
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=bayesian+methods+for+hackers+cam+davidson+pilon+pdf PDF link annotation
    • http://souve.me/weather_forecast_for_bulawayo_next_10_daysks7p7.pdfIn PDF document text
    • https://lusugola.weebly.com/uploads/1/3/4/5/134599647/36cebe835d698d.pdfIn PDF document text
    • http://acupofjacob.com/past_simple_passive_exercises_easy7kcof.pdfIn PDF document text
    • http://mamontov-net.cc/lejulefesud9sn54.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/377033.pdfIn PDF document text
    • http://nutesane.iblogger.org/adobe_professional_for_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deketinak.rf.gd/40900359891.pdfIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_3fc32ab233b64c14aedc06ba4ad4796d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4251f2-d7bb-4f91-ad32-9c245f04a390/makador.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde02408-ac46-4e0c-a5eb-1a96797b1d5a/21515978458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dca1f2-c13e-4584-9ce7-b2faacc2d7be/64360565128.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_b320bf6e6b0849689050af9a8c590939.pdf?index=trueIn PDF document text
    • http://sivisalatifaba.rf.gd/queen_bohemian_rhapsody_chords.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_c779f391038e4f9f981c32ff54158051.pdf?index=trueIn PDF document text
    • http://bonejaje.rf.gd/tetozurowimomaxamurosuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6441ed7d-4d24-4ce6-a25a-d572d153bb91/samsung_printer_c460w_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990f2f2f-744f-43c8-b5d4-87294da62cca/2579514412.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5668 bytes
SHA-256: 602408ae16dbc0e2780eba085cd108b777941c4f96b8e49c9d38a3f008408fe3
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 11000 bytes
SHA-256: c4653af8bd9eeaaf61c3bab77d2f0cfa2fc95c39fbb75efc2dc80aee3fc8c596

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