Malicious PDF — malware analysis report

Static analysis result for SHA-256 16908ca1bf771af5…

MALICIOUS

PDF

82.2 KB Created: 2021-01-28 13:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 6281095c1c46c19186d8943f927958ba SHA-1: 45f5b3d4d99441c6898a8c6308907106ed4d8f87 SHA-256: 16908ca1bf771af57187f341089b7c877cbba54d6b78c3d5427de51be51938ca
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://yafferge.ru/wb?keyword=dungeons%20and%20dragons%20online%20ranger%20gameplay In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fee911020b2e.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/jifuf.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/AIy3ghr/33066948850.pdfIn PDF document text
    • https://cdn.sqhk.co/pavuraxutem/RLahh1x/hex_empire_2_free_online_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_600ebd19a43f9.pdfIn PDF document text
    • http://dobafeser.66ghz.com/51393153446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fe0de08e486a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453134/normal_5fcd28463f506.pdfIn PDF document text
    • http://juniwasobevi.22web.org/bet_365_poker_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5ffa179baec12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fdfbcf16d7a7.pdfIn PDF document text
    • https://nopogevoxipati.weebly.com/uploads/1/3/1/4/131410158/03f899909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxidowu.epizy.com/cheetah_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/board_resolution_for_removal_of_director_template.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/zurasefilosigifowetimope.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_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 5380 bytes
SHA-256: e173ff88797b8f48dec421a17d8477337e6068779c06b039cdcd78c1ce8e3e43
font_01_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 10912 bytes
SHA-256: aa6dde911161be18e7b5dbf92928272dd99db01284845484118abdc2a4b60cd2

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