Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f3e0b6dad3dd0c…

MALICIOUS

PDF

106.4 KB Created: 2021-03-10 23:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7dacfc1fa4008d063ed3473a49dca4fc SHA-1: b9edc760a805193477c640672c114bf400e3550c SHA-256: 87f3e0b6dad3dd0cbeb39708f048a6afff1f404c46edbab78a2c28fba4d1643e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded links and the nature of the heuristics strongly suggest this document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8836

Heuristics 6

  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://midufefew.ru/award?keyword=teoria+y+practica+de+la+administracion+publica+en+mexico+pdf PDF link annotation
    • https://cdn.sqhk.co/rifelefiw/iheBjdY/nasal_cavity_structure_anatomy.pdfIn PDF document text
    • http://idealslimitalia-official.site/dnd_taldorei_campaign_setting7jo8k.pdfIn PDF document text
    • http://mkr-olimp.info/plant_physiology_book_for_icar_neto9n5b.pdfIn PDF document text
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/bba26577b1.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/UgdvZib/36464202998.pdfIn PDF document text
    • http://prizinsta24.online/582787590001l25i.pdfIn PDF document text
    • http://belkwigs.com/1391678380739b15.pdfIn PDF document text
    • http://torchland.xyz/weider_2980x_exercise_chartblduh.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/dumidologalabu.pdfIn PDF document text
    • https://pisisixiva.weebly.com/uploads/1/3/1/6/131636779/gefazeroxofuroli.pdfIn PDF document text
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/vuliti.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/network_marketing_wikipedia_in_marathi3pplk.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/fihgcia/larojunafoj.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/n0rxNgd/67607341830.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/geiCngj/simple_future_tense_worksheet_for_grade_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_32c7f0825b114c7cb0195ca5bb67acfa.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_480f66290a6b47edbb12efe259880168.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_21077d2fa023460d8f13e737b62ade99.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_59950c586aa84280b4001b613d1b1acd.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_81d55e22f98f47d2acfaff019b90a76e.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_c092a2c2beec4051a5ad5aa47ca8c5f9.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_1befece50eff44948099e65501174c86.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_c2af0f6ff1da4cfc9076e2d7b87eebaa.pdf?index=trueIn 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_off00016ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF1 5560 bytes
SHA-256: 4b2f48da6a29c41c7c1595b313a1e536143388b193b4a1a37a8dade745f47b0f
font_01_sfnt_off000181c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181C8 11708 bytes
SHA-256: d04a415ff08317993afd97ec4efd6c82993d978e37a7bcb9ea52e2addadc2ba1

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