Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd3fb3942887fc…

MALICIOUS

PDF

72.8 KB Created: 2021-02-16 02:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c84a4fde30a3539da1a9c18062cd80b8 SHA-1: b7ac8fd51857567f3978159c10623a50d9bb368e SHA-256: a0fd3fb3942887fc3cc7c33b6e97e5ea95253eb41084545c76481dccde31fe56
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a suspicious domain ('maypoin.ru') that is likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=slim+x+genie+keto+reviews PDF link annotation
    • http://bezigex.iblogger.org/bristol_stool_scale_form.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/iCul6ji/undertale_stickers_for_whatsapp.pdfIn PDF document text
    • http://matcobzor.ru/vulegufasudekul61t8b.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/82419797803co45t.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/bijhggi/fetofo.pdfIn PDF document text
    • http://jizawilezi.22web.org/active_voice_and_passive_voice_question.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_601f1385a25e1.pdfIn PDF document text
    • http://online-sistem.site/23378028745xjod4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_601e4827b00cc.pdfIn PDF document text
    • http://com-signto2.xyz/catalogo_dupree_campaa_14_2020svn9s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fe956ae95e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5ff9d65a93f45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nirirojigupe.epizy.com/57122225644.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/canon_imagerunner_1435if_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/desh_bhakti_song_video.pdfIn PDF document text
    • http://jogulele.epizy.com/vfc_temperature_excursion_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/30380547119.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/vowepivoseralobaf.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/97615876886.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5180 bytes
SHA-256: d97f6a6421f43b30ec80db9f1645d4188ee967f15b90e63ca6cbcbdc0e30a303
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10936 bytes
SHA-256: 4f6a5418809aa236a7546a69064b96be809f6486e8c2cce26b14973da7d4661b

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