Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81937fed00bf5fe…

MALICIOUS

PDF

71.7 KB Created: 2021-02-27 16:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5f83957fc396c53371614d32191dfd57 SHA-1: 687502dd1a33706b70c8c3f5808f12d3ce070107 SHA-256: e81937fed00bf5fe5df044e1e5f166cd05af8129ab5a47fe494af68bd09cc2eb
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://dafemum.ru/wix?keyword=proform+770+ekg+user+manual In PDF document text
    • http://jufawet.iblogger.org/firefox_developer_edition_32_bit.pdfIn PDF document text
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/tiwope.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/gufghja/spirit_riders_dvd.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/great_interview_questions_to_ask_interviewee.pdfIn PDF document text
    • http://gevixadita.22web.org/76984350243.pdfIn PDF document text
    • http://nupubidodeje.22web.org/44281693679.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/ijKDofy/bubble_tea_wallpaper_desktop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizujupena.rf.gd/mewetotijawijer.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/vivapitetotoxosegow.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/55961561125.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/skyworth_65_inch_uhd_infinity_android_tv_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/how_to_actively_listen_to_someone.pdfIn PDF document text
    • http://buvumitibeve.rf.gd/tifepasapuruv.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/magnesium_oxide_post_lab_answers.pdfIn PDF document text
    • http://kudawugijamino.rf.gd/50178997062.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 5376 bytes
SHA-256: b228c3ba52f454f2b92cb940a03adbfe9a89851e7128197286ce2159946f4d56
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10080 bytes
SHA-256: d4588669119b62d5d9cc663312a7ec1a7fdac275383c497d90be7f06f2ac4ff5