Malicious PDF — malware analysis report

Static analysis result for SHA-256 47db9aba26007801…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 22:17:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 36fee5551bd35f7298c2a4457473390c SHA-1: dee79edeb126cffac8bb18b6f9d193ee922adba3 SHA-256: 47db9aba26007801852b3d33f2575b3732e93bda6948eab1668e9d60011c6dbe
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs point to suspicious domains, suggesting the PDF is designed to redirect users to potentially harmful websites for phishing or malware delivery. No scripts were extracted, but the PDF structure itself contains numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=poblacion+y+muestras+de+un+proyecto PDF link annotation
    • http://geesecam.com/graco_magnum_x5_manual_en_espaolt7ij4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d878c49a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5feb5dbd5b3ef.pdfIn PDF document text
    • http://getbuiss.online/sap_basis_tcodes_with_screenshotsdl1vu.pdfIn PDF document text
    • http://ellmax-site.xyz/blue_bloods_episode_guide_2019ws9l7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_600e5ad084b73.pdfIn PDF document text
    • http://naturagrush.space/25581076013430qy.pdfIn PDF document text
    • http://eurozone.pro/11127865055fuz23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388627/normal_6002d1d68aac9.pdfIn PDF document text
    • http://price-list.moscow/zateremizilijetepiex8ox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fe986a90434b.pdfIn PDF document text
    • http://septiki-rf.website/super_world_of_teddy_bearspimb5.pdfIn PDF document text
    • http://webdefilmizle.com/how_to_pair_denonkpybk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxunuwozen.epizy.com/48160956157.pdfIn PDF document text
    • http://rowagaparik.rf.gd/13656675987.pdfIn PDF document text
    • http://muresapidun.epizy.com/chemistry_density_of_gases_worksheet_answer_key.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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 5464 bytes
SHA-256: ccccf8bb401ea8ed98f5563194cb0be910474120742f743234806c5622661bc3
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 11712 bytes
SHA-256: eb5a95396ab73fe01b3d3efcacfb16e26b69cb7aa49978c3f04dfa6f90d3535f

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