Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea6941cb90188a0…

MALICIOUS

PDF

68.3 KB Created: 2021-04-01 00:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09dd9bb803d5860f6e29abc33916c8d6 SHA-1: d1ba0e9198f3563e9b9455831f82d19caa0b7cfc SHA-256: 6ea6941cb90188a0b113e2cdce10065863ef97e81b70b6177433db54ead20ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDFs with numeric slugs, indicating a link farm for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cdn.sqhk.co/gulizate/zttidmc/xofogesigodifiwoj.pdf
    • https://cdn.sqhk.co/nonuripot/ZYGw1ro/harvest_church_riverside_pastor.pdf
    • https://cdn.sqhk.co/lazemowul/jiHYjdH/italian_music_songs_download_tamil.pdf
    • http://medugogubi.22web.org/pilumoguzemirug.pdf
    • https://cdn.sqhk.co/vedimurami/No8ig4i/60841920499.pdf
    • http://contentmedialiteracy.com/stickman_hello_stars_gamee0sv4.pdf
    • https://cdn.sqhk.co/tukepola/fijUjbt/abc_rhymes_video_songs_free.pdf
    • http://livecopyrightverification.com/best_tarot_spread_for_beginnersmemb1.pdf
    • https://cdn.sqhk.co/vaxofalu/gr0uQ7o/pamikidodijisusonal.pdf
    • https://cdn.sqhk.co/xewafazuk/wqkOJia/86642532359.pdf
    • http://vashobereg.com/breville_tea_maker_instructionsiwmov.pdf
    • http://belixawotid.66ghz.com/birmingham_barons_schedule.pdf
    • https://cdn.sqhk.co/kasuvapexal/HY2Thff/cg_comedy_new.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=natural%20selection%20movie%20watch%20online%20free
    • http://borovob.epizy.com/dotamugajibamug.pdf
    • http://vetuvawefaxuta.rf.gd/imagemagick_convert_to_tiff_black_and_white.pdf
    • https://uploads.strikinglycdn.com/files/aeccaf12-b893-49d2-a0bc-a0d00591a360/88247473068.pdf
    • http://memegimowa.epizy.com/82538176243.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_973ab4eb71024c109eee42be8d2e75d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1023526c-7a89-40be-8b97-c2b8e35fdd11/vowipuxime.pdf
    • https://uploads.strikinglycdn.com/files/608358d6-7565-453d-9aeb-58fe09fda135/pemupelu.pdf
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_2177019e6c144f69a2d4d3f3c4cebd1d.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_d0117a7a3ea642d882cfc2f6b87caaf4.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf94.bin
0c96224b42be7e62ee0a09fc9bb5fc9fc9a8d370647c02a7d9a1e5eb6211f7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 5244 bytes
font_01_sfnt_off0000e158.bin
e4f6edef9edc602b5974803bb69cd0567ec6a448e4c5524380a01c707f0f0327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10044 bytes

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