Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5554dffd67d947…

MALICIOUS

PDF

73.7 KB Created: 2021-02-11 17:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3da8c08110285245c7c7f9086716ce19 SHA-1: b7bc6e9d4ac492152d3dee7129f94dc054508341 SHA-256: cd5554dffd67d9475997ba3a2a599375051febdf3661b6e5675c287acf6c0f16
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, using an SEO redirector to disguise the malicious intent. It embeds multiple URLs pointing to other PDFs, suggesting a downloader or redirector chain. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing.

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://seumenha.ru/123?utm_term=food+street+cheats PDF link annotation
    • https://cdn.sqhk.co/zogameva/hiiehje/city_rider_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/czjige9/76236351812.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/dD63pUk/39646300333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc4d5929e92.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/fQy6hf6/26420870563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_6011cdf3d31fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fd814e7160d4.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/lhcaggj/german_chocolate_cake_cooking_classy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fcf029ceb93e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_60144b63ba45e.pdfIn PDF document text
    • http://snatural.space/132272955233234q.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/icFhijc/red_ball_3_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_60202c18ba740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_601f8e8bde2e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_60106e4bb586b.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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 4584 bytes
SHA-256: 1aa42231c79d5135ef0c702b0361e891c9751eab0d045c1f52a30715e2161b95
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 11620 bytes
SHA-256: faef246134748d5724953d8ca9f9a19d00003ef13146daa682ce25fa66a97692
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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