Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4fb4003087b4aa…

MALICIOUS

PDF

72.8 KB Created: 2021-03-03 18:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 934cffb76977a56b3974d65e52fd684a SHA-1: 778c8b7aba7cf47feb7199e99dc50b193ba63ee2 SHA-256: ff4fb4003087b4aa212682ea77c71b9d81f78435ce45e1de55059db7cd3132a8
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/award?keyword=total+gym+1000+manual+de+ejercicios+en+espa%25C3%25B1ol+pdf PDF link annotation
    • http://futufudag.iblogger.org/12077381971.pdfIn PDF document text
    • http://qwert-ita.fun/dazudabw1kd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fedd356ae197.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/d1vhaje/disneyland_resort_hawaii_packages.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fdd5f5f6083a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ffb0c4c8b65d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5ff849e93fce5.pdfIn PDF document text
    • http://tijoxuxiga.iblogger.org/possessive_form_of_family.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_601a76188c6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_60298f5f92ab3.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/latest_version_of_windows_10_1903.pdfIn PDF document text
    • http://silver35.ru/baby_bjorn_bouncer_balance_vs_bliss6lgfi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5fe3f31a1f926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketanuviz.epizy.com/fannie_mae_rental_income_worksheet_2017.pdfIn PDF document text
    • http://putazosaw.epizy.com/classifying_conics_worksheet.pdfIn PDF document text
    • http://kilobawul.rf.gd/73740990148.pdfIn PDF document text
    • http://putetudufotu.rf.gd/81830446843.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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 6008 bytes
SHA-256: 867fa28983dae7cb7e9e23700b7fc4baa5d1bcc78747607514f19d666623729c
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 14288 bytes
SHA-256: c7aa5f050e7628bc6b98b6a19954dbd86b8135f8742d55a786fc5ef815dbe445

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