Malicious PDF — malware analysis report

Static analysis result for SHA-256 641b13576b473581…

MALICIOUS

PDF

74.4 KB Created: 2021-02-19 04:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 38cfcd5d357d5218a5cd7e671da65e1b SHA-1: e1c520d334de1ae5f2f37a79b43735d4d4b3da9c SHA-256: 641b13576b4735817b0a9d938e5c4fadfba358125a546d9e14e22346439917da
196 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/123?utm_term=how+to+build+strength+while+running PDF link annotation
    • https://cdn.sqhk.co/nukunudakiju/jbhfigO/soccer_player_turned_nfl_kicker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fcd6cf773cd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5fe4257f71577.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/1630745.pdfIn PDF document text
    • https://nokidevekixim.weebly.com/uploads/1/3/2/3/132302759/wabupebugodidulol.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/TVfFS9y/new_sad_song_ringtone_2019_download_mp3.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/lizopolijugiva-zelegotaxekig-lovifapibe.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/ihMoPjh/11848795887.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/juvetaso/jonalupeligiruwivufubuse.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/96496887420.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/auto_reply_email_message_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/bunty_funny_videos_in_punjabi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/online_bubble_sheet_grading.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/95502796353.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/storm_druid_pathfinder_guide.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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 5072 bytes
SHA-256: 2a9da0e2437413716b928070ea3bb7a0132f6b829922ad5504ef9ee7da1cfa58
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10384 bytes
SHA-256: 41449438a0a7a07cffa45967db31a2344fdc8b8eeaa31e66f83d3847f26b480f