Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb7902515080281…

MALICIOUS

PDF

73.9 KB Created: 2021-02-28 09:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d1ffc5d2a69e163c3f34897fefc73585 SHA-1: 7545644a64237c9f9880b92e9060366c6f57b403 SHA-256: 3eb790251508028161eb20c9fa28d8637eb9e020b708c39398191a7eba1080b4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an external URI and an image lure that redirects to a URL associated with free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of multiple malicious-looking URLs suggests the document is designed to lead the user to download further malicious content.

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
  • 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://fokemale.ru/123?utm_term=evinrude+18+hp+fastwin+weight PDF link annotation
    • http://cashbackk.site/foxod8gl6r.pdfIn PDF document text
    • http://dirtygirl.fun/hunger_games_book_1_wikipediasehuh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600e23d161fa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5fc593739e5e6.pdfIn PDF document text
    • http://podjem2.club/331128367iex5f.pdfIn PDF document text
    • http://vengriya.space/64100145991yrluj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_5fcd9b2d3f3da.pdfIn PDF document text
    • http://temilops.xyz/picsart_background_full_hd_wallpaper7nxjm.pdfIn PDF document text
    • http://detonic-italy.website/disgaea_transmigration_guide51xb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_6025a961e7b3b.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/pevarijidasalop/76014831311.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/apocalypse_culture_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/58674265936.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/template_of_a_letter_of_application.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/43683354676.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/physiology_of_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/general_knowledge_2019_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/lacoste_polo_fitting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/html_css_simple_templates_for_beginners.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_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 5628 bytes
SHA-256: 65d768d7560fb9d3b2fb64522288a827421ab18e8b77885a2037e659e5b75b0a
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 10984 bytes
SHA-256: 621f3a333caf4de77f05a42a5dae13bf945249e75361e1564d1cfc13439dd860

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