Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8413d8c3147f0be…

MALICIOUS

PDF

73.7 KB Created: 2021-03-19 14:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 455cffc9edc86939fec4b773ec72f442 SHA-1: 7d41b00bd00182d307b9849964c12b8a840e97b3 SHA-256: a8413d8c3147f0beaa7527119d2ce59e783092521f0529920cb0c030481bd1e0
136 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an external URI and an SEO redirector link pointing to 'https://ponafet.ru/wix?keyword=16.3+biology+workbook+answers+third+edition'. The PDF structure and embedded content suggest it is designed to lure users into clicking the link, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://ponafet.ru/wix?keyword=16.3+biology+workbook+answers+third+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ffc8eb6371c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fe6427bd8185.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/jhgdghh/the_perfect_roommate_imdb.pdfIn PDF document text
    • http://pasendapp.online/elements_of_literature_6th_course_answersfbgb5.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/ghchgia/vatosogevadowato.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_6001fe88d4845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_603658c427379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_5fe0b3bd76a73.pdfIn PDF document text
    • https://cdn.sqhk.co/titubebojek/sQAjfkz/vitokijasejugiluvu.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/s5hfzja/25816406928.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/2XUijiB/car_performance_shop_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_60418671bfdee.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/jiifjbr/43617523286.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/WgfPEib/xomejele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5fcca04a6cc76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6048d3152d367.pdfIn PDF document text
    • http://mmamba.ru/how_to_use_a_nespresso_krupsmx7q9.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/hbFubRw/91467419011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_6008eb11802ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600a507857f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428054/normal_5fe57c4860130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 5580 bytes
SHA-256: f2ebcdfb65876f113580dab4c07d1f1911b120cf5838f2583833bb4fcbcb41f8
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 9796 bytes
SHA-256: d21745bc7bbc637adf4463470946b90c2cb1a41c2d3b62048b94d50f4d4275e0
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2