Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f960be99ca26499…

MALICIOUS

PDF

69.1 KB Created: 2021-02-20 17:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 79a8dbd1949f88ce6891f9dcd6d06948 SHA-1: c32b402f615e2c65f924218af6048d312cbd9f5b SHA-256: 1f960be99ca264996ebc54c9ba754efbaa4ee4940a79e4dfc63d00553a9d0ab3
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/wix?keyword=blood+type+practice+problems+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/pomorezolo/ggpgeb9/biledalo.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/Vieij6h/turbo_racing_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fdf8d867835a.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/idbgecV/13691835976.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/jdhgjiN/ups_office_goldsboro_nc.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/roxumij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405414/normal_5feb0daa22d14.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/chi99Tu/77812630923.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/4Kjbkoa/vegogibunasoru.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/FYjatgi/94940665995.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/hdqHhgU/pba_tour_bowling_2019_earnings.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/fhejhpx/gobegizafubitexesizeguxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_60086ab837747.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/fajujiju/doxuroriligufuvini.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/batman_arkham_origins_dlc_skins_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/informal_letter_writing_topics.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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 5760 bytes
SHA-256: 1921df10fe5fa04607271a51197f54bd9330113c10c4a621c0400078bb3dcecf
font_01_sfnt_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 9940 bytes
SHA-256: 3ddc51d7fb01adf6db1bf349f0f1996eaed863581569fa2d3861245232c309cd

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