Malicious PDF — malware analysis report

Static analysis result for SHA-256 520cb3eaaeec2d1b…

MALICIOUS

PDF

71.3 KB Created: 2021-03-03 16:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 27676c6d65b5928fdf8092f8c4d47a66 SHA-1: e0e10fc58098e5e87d859a384ad757a9e7e79c89 SHA-256: 520cb3eaaeec2d1b45156c0e3f77e00a40d450a9a369cfedd4479a43c0b2bba7
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=suunto+ambit2+watch+band In PDF document text
    • https://cdn.sqhk.co/lijuwezasip/xgfdgea/resuwerajojiravulubome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_602af4bd793de.pdfIn PDF document text
    • http://nusoxex.iblogger.org/cant_install_office_2007_on_windows_10.pdfIn PDF document text
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/9340333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5fdf7b753a8d8.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/remeranexe/historia_de_mexico_unam.pdfIn PDF document text
    • http://godarujugil.rf.gd/tokyo_ghoul_3_osu.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/sulphur_mountain_trail_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/letters_and_sounds_book.pdfIn PDF document text
    • http://jisimutegajive.rf.gd/73470227333.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/amazon_appstore_for_android_4._0.pdfIn PDF document text
    • http://dajomezivurisal.epizy.com/bachelor_in_paradise_au_episode_guide.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/41377325089.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 5340 bytes
SHA-256: 27109ecd6b3b92c42ffa219884278e1dac4f1055def81171adb6d65810b41e39
font_01_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 10472 bytes
SHA-256: 96525d763c07fba20485d18b9498e2f78519fa7c37aff334cbd3c7af1a072fc6