Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f7b4dc856dfd0b…

MALICIOUS

PDF

62.2 KB Created: 2021-01-30 09:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 3aecc1f87f2f008df41528b0581ea9c7 SHA-1: 43d7ffcf5cb857fd7e6ea34bfc9885f0231435a2 SHA-256: 50f7b4dc856dfd0b1bab2f781728565e6c54aec98d81174da82fb55fb0656140
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/123?utm_term=nardi+steering+wheel+wood In PDF document text
    • https://cdn.sqhk.co/kowetitemaro/aEjuGVm/12706473362.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/hgdNrgh/83380992482.pdfIn PDF document text
    • https://cdn.sqhk.co/nezotelo/hdyhgY7/84639861143.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/cjernY2/78436679126.pdfIn PDF document text
    • http://subfamjtii.site/bunny_pop_game_free_download_for_pcquel4.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/Ejjjgie/street_hoop_basketball_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/dVjbgeI/sewaxofofaxasu.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/XYmgcgf/41732309484.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/7138454.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/ciaWAB2/anger_management_books_amazon.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/safenalavojuwu/68513782445.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/amazing_grace_piano_accompaniment_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/bidef.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/zemotujuguxidizowolefal.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/zelienople_police_reports.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_off0000b724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB724 5148 bytes
SHA-256: 4c54276b700fd647d1ff8f04be9de68529df637bf5f4a363d70504038768e451
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 9940 bytes
SHA-256: 8899770bbaa3ab62f2b021c3b521b4ebc0e5b53d68b6ae753fa7ee297a8f8746

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