Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d19eb0e786a739…

MALICIOUS

PDF

73.9 KB Created: 2021-03-29 17:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 211317b719e2d79f89b78a32ba76773e SHA-1: 223d3575231b0a47edbe8a4833c6ac4abe6dbfca SHA-256: b6d19eb0e786a73976df9c552e489f51ed2dfae65408e20acaf1e2f3905d1321
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity rule indicating it's an SEO redirector for phishing, and a critical ClamAV detection. The embedded URL and the ML classifier output strongly suggest a malicious intent to trick users into downloading a payload, likely disguised as a budget template. No scripts were extracted, but the PDF structure and URL point towards a phishing lure.

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://seumenha.ru/123?utm_term=simple+budget+template+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379491/normal_6043b717c0ee0.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/jf3jcji/80768337353.pdfIn PDF document text
    • http://philonio.online/lab_report_example_biology_enzymesok2zu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_6009667b956fb.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/67408804653.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/sQbGvgg/rodufediputakofinid.pdfIn PDF document text
    • http://oneitstore.info/354441042702rzw3.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/85727892916.pdfIn PDF document text
    • http://graatorama.space/biannca_prince_net_worth_2019bstqc.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/grade_9_math_textbook_answers.pdfIn PDF document text
    • http://koolmaxt.online/jevawabopibilobut3pao.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/gtn_650xi_manual.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/nikon_dx_lenses_55-200mm.pdfIn PDF document text
    • http://golixudib.mypressonline.com/formulas_and_functions_in_excel_2020.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/punagilelabon/searchview_implementation_in_android.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/dojivigaxonuto.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/swiffer_wetjet_wood_floor_spray_mop_starter_kit.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/vasuvivilesemo.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/wonedugamutu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/pafukodatiwoxopozosam.pdfIn PDF document text
    • http://kegigija.atwebpages.com/83174763414.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/metoguderubibupujovob.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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5312 bytes
SHA-256: e2a2fc225edc0f3b4cb10d810be04ab3b288081adfd8480f52e20223d94d68e4
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 10704 bytes
SHA-256: 323c13b60d3696304f0ee9a5b16b2e1f746677a1228e1aa5c3db8ca17c73bf39

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