Malicious PDF — malware analysis report

Static analysis result for SHA-256 825cf2a5eb15dd45…

MALICIOUS

PDF

65.2 KB Created: 2021-02-27 02:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: f4dcbde8acceef156b00458513962d25 SHA-1: 4c2a6c22cdf71aa17a36025044566b3e7a61faca SHA-256: 825cf2a5eb15dd45852efc36a3b882a7d642eb35ebe7bfbc37a2bd7edd2d21ca
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=how+much+oil+in+troy+bilt+2410 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4409238/normal_6007599e529e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/mcie8if/merge_ninja_star_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_602714a57dab9.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/eVt67Dx/color_fill_3d_app.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/banipupapal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fc82d7b826f4.pdfIn PDF document text
    • https://cdn.sqhk.co/vapelomusanu/ihhighi/farming_simulator_14_gry_online.pdfIn PDF document text
    • https://guvixiwek.weebly.com/uploads/1/3/5/9/135976323/tedawoxatig.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/OgcV1si/power_rangers_legacy_wars_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/yZBibgc/56704458144.pdfIn PDF document text
    • https://cdn.sqhk.co/dafagupovo/T8aQegj/66562353002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5ff53cf166d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384634/normal_5fe4e9ccd1d4b.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/wMicAig/vuruwaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_600c7f3c4bfcf.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/hidf4s8/z_stickman_battle_of_dragon_super_warrior_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 5360 bytes
SHA-256: fd19702726f5f6057e3287c78fbece359920a416e4941e5034ecda270daad9b1
font_01_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 10612 bytes
SHA-256: dd1fc4484831e708d0dc88f6b7a5f1f8e2202553422778257866d33632cdfe01

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