Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f905654ecc4a492…

MALICIOUS

PDF

68.0 KB Created: 2021-02-28 18:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c12e5bd1c775a446eb8a172ac98eb71c SHA-1: e37c7eed72df954691e420ba31428fa7c682b725 SHA-256: 9f905654ecc4a49246644d2c08291d4d0990fd8de3a73294c3d2113850978eda
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm or a downloader for further malicious content, likely related to phishing or malware distribution. The presence of 'utm_term' in one of the URLs points towards a phishing lure for free downloads.

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://botokaw.ru/strik?utm_term=agatha+christie+short+stories+pdf+free+download PDF link annotation
    • http://jikusofare.mywebcommunity.org/yongnuo_yn-568ex_ii_nikon_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lovolipeg/iSymife/five_below_las_vegas_hours.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/mirexalesamuvunapuvij.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/midefin.pdfIn PDF document text
    • https://cdn.sqhk.co/repoxovu/c3ib9hc/34141069986.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/cDhgGjd/33814019717.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/jd3Hpge/wifilojibusak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_6009dd106dabf.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/c_primer_5th_edition_review.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/vadixibojob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_602b0168e2cfc.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/cub_scout_handbook_bear.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawokale.myartsonline.com/fuxuwukagavu.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/online_project_management_training_programs.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/sasago.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/49247536522.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_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 5496 bytes
SHA-256: 3e458f3df1f26858c741498baf1a9b24dd5aa3aef1d719d9ce6750df99732de9
font_01_sfnt_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 13636 bytes
SHA-256: c02826ebad0fe7d98d838b65bb221a3a9855dffa6a11c2b855cec31a409eb597

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