Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b9ba6c5a5756c…

MALICIOUS

PDF

163.6 KB Created: 2021-03-03 23:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d5136fa425b08399d66726bcd2644fa0 SHA-1: 219c0d730cf16080dfea873a2c540d8556f7aea5 SHA-256: 1c8b9ba6c5a5756c10d99427396193b643636ec4c54b6e5f750abbf2d9d1cd6f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/aws?utm_term=principles+of+biochemistry+4th+edition+voet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446272/normal_602d05152a0dd.pdfIn PDF document text
    • http://prizinsta24.site/jojupewufefezexusolenegu1st3z.pdfIn PDF document text
    • http://okstore.info/toca_life_neighbourhood_aptoidecs6tr.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/5044410.pdfIn PDF document text
    • http://ilkertr.shop/allison_transmission_manual_valve_body5myfb.pdfIn PDF document text
    • http://wanikagupefurav.22web.org/mfj_993b_tuner.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/vilomo_zuzetozura_nutemirixodoxab.pdfIn PDF document text
    • https://vudelugofede.weebly.com/uploads/1/3/4/3/134383428/23b24b2d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_6031c3120be0f.pdfIn PDF document text
    • http://jafedaroz.iblogger.org/wahls_protocol_diet_plan.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/glacier_bay_faucet_installation_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fc5ef45095d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafizojuxibido.epizy.com/75441071946.pdfIn PDF document text
    • http://gerutijotinana.rf.gd/addition_and_subtraction_worksheets_year_4.pdfIn PDF document text
    • http://situwosase.myartsonline.com/38046397049.pdfIn PDF document text
    • http://sixuvurubemile.rf.gd/sinox.pdfIn PDF document text
    • http://firasakujataj.epizy.com/jilupugaxuwojekakin.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AFA 5576 bytes
SHA-256: 88deb5dfaf7dceda09928bb19b89de3a5c9a34a6b4e7f3b3954c1d051e784696
font_01_sfnt_off00022dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DD4 14648 bytes
SHA-256: 456a04f1f12a7c92e6a5e1c6f88de5c84b408f82f932a219463a663aac77d29b
font_02_sfnt_off00025b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B85 16072 bytes
SHA-256: caea212bfaaf2897f4851770f673d25c90b0e412378cb4b0d6f36fafa9739068
font_03_sfnt_off00027023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27023 6076 bytes
SHA-256: 820851b731abc509e86fd424ecb961d9d709cc5bf8777c35c00b4009ecb0103c