Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bf712e38036dfb…

MALICIOUS

PDF

70.2 KB Created: 2021-03-15 18:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e224451ffbc5302612ac23ba9c2972c4 SHA-1: 83333f847ee610d746981b7fc7a9f987d0f99c4c SHA-256: b7bf712e38036dfb43440ce5c7842609ed5d0f9c612e7ab2ce82a8c425112967
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=differential+topology+morris+w.+hirsch+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601dca2f65446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_6028699c48ac0.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/DknxhjV/14452434542.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/2u0dggz/uc_browser_mini_apk_download_for_jio_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fcb6b9b4e3d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_600276c4a079e.pdfIn PDF document text
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/88eb80b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5ffe06371a99a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5ffb2e2f543be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fedcf9fc75d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_603442d35944c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_6006ef5b439e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6024ae1d821d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_5fd6526cc7bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_6046e51f422e7.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/maluxesawogoxilifiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_6036d6a375652.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/dhi0qVi/vertigo_attack_causes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9cdaf5-d7b1-4e68-a56a-6a6245aec6c8/navabetevobezus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fee020b-dc04-4871-a805-dcfe5beaeeb6/to_my_dear_and_loving_husband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32ba5e6-518d-4926-95ef-638a94aa8332/how_to_punish_yourself_after_eating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddbcb49-fe08-473c-b68c-8696e1332bca/gesozufadexupofezosajazi.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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 5796 bytes
SHA-256: 5b3448fbc17434d92fca32a7a554cc02032e7efcfdbc90da3a74eaf5868ada09
font_01_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 9440 bytes
SHA-256: 2bf3851ef3bef18b6dc65f03a2db793fc788e7072dda2174e262cb8d5b0d735b

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