Malicious PDF — malware analysis report

Static analysis result for SHA-256 33051d8cffd7c118…

MALICIOUS

PDF

68.2 KB Created: 2021-02-08 02:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f970a1eea5fd61e407a9dbed6b26df20 SHA-1: 889453b430a25614cde39f01e306c633178712a9 SHA-256: 33051d8cffd7c11882953eecb8798e110a7958323b0fe64f2cd9e96a7e601ef8
136 Risk Score

Malware Insights

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

The PDF document contains a heuristic indicating it's an SEO redirector used for phishing, pointing to the URL https://bologen.ru/wb?keyword=bimanual%20exam%20osce. This URL is likely used to lure users into downloading further malicious content or submitting sensitive information. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wb?keyword=bimanual%20exam%20osce PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414342/normal_600b0e9aae57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6017327c11688.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/hjieiht/auto_press_keyboard_for_roblox.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/0hae738/foxijarive.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/muzuxul_farizo.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/3009279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ff712eb0a051.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/uGFWVhf/minecraft_free_server_hosting_24_7.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/vazibefewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5fc96e0e7a08f.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/jOhgggw/60291652932.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/jBgdYNM/85512541694.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/niaY6gd/cross_stitch_pattern_maker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/free_template_for_curriculum_vitae.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/levojevixesojagajututor.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_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 4968 bytes
SHA-256: 6f5c9497b2306072db5a4f405ed4db6f1179717fe66aeed58293ff9f8740ef3b
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10044 bytes
SHA-256: db8c6e2ec29c493bafac290a4532cd58aefb4ba4668e65e2534c71272abbc7d1

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