Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b45ff9cbcbb490…

MALICIOUS

PDF

85.8 KB Created: 2021-03-18 09:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16ec2d577f68f57eb223d612ec98dd5 SHA-1: 239a4176e234026454b829d9e1bb525687d88925 SHA-256: d4b45ff9cbcbb490120ec30b88b853175f73ce2ad5e46353f2327aead023c954
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "PDF link farm" designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/123?utm_term=physics+lab+report+accuracy+and+precision
    • https://cdn.sqhk.co/kugorazig/GVjjmgp/zuled.pdf
    • https://cdn.sqhk.co/tuseliwi/idjBiba/personal_fitness_trainer_memphis_tn.pdf
    • http://idealicaitalia-oficial.site/vamugowowigimo20jvq.pdf
    • http://prizinsta24.space/latest_gospel_songs_2020_nigeriam7wy2.pdf
    • https://cdn.sqhk.co/feguzuvubut/P40Qbhi/cut_the_strings_quotes.pdf
    • http://venira.su/foxasododawitiloh8h65.pdf
    • http://faceskinagainbeauty.xyz/siluzamu75ql2.pdf
    • https://cdn.sqhk.co/vesagivara/cro0Xva/pakefibedudafesal.pdf
    • https://cdn.sqhk.co/tawibonikigo/euWLj51/22848541551.pdf
    • http://keepxufi.space/magalugon3rrsc.pdf
    • https://cdn.sqhk.co/sesexibanobu/emwLDof/hoops_pinball_machine_for_sale_ontario.pdf
    • https://cdn.sqhk.co/finelega/4BiioUM/easypay_metrocard_account_number.pdf
    • http://marafonsport.site/pubezapovawezedipejunmndr.pdf
    • https://cdn.sqhk.co/dekaroku/dhifjgO/clipless_mountain_bike_shoes_for_wide_feet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_51b44561eb6f41c38a1a6dd7b9915de9.pdf?index=true
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_c6d4ddc51fe64ff398050f757b54b145.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3820f68-fda7-4251-94f1-8d319e1691bd/add_facebook_video_to_wix_blog.pdf
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_a57011b40dab488daeeca126ee6a9544.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_8e21d64adad442329e32fcff1a25809a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d2d18dc-ba16-4917-8e2a-b31949ece72d/63808811220.pdf
    • https://uploads.strikinglycdn.com/files/df19e9c3-0375-440e-afc7-cc4c96a4190b/rademivokexubivuzosuzufaw.pdf
    • https://uploads.strikinglycdn.com/files/eb0bb290-767e-4721-b28a-60630f4ae1d5/honeywell_hcm350w_germ_free_cool_mist_humidifier_white_walmart.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_7d9a576e20e1415d885d01cd366c69c8.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_off00010f07.bin
b338dfe24c20ae7fdb21613039fd817d5a9cfb68cbe189a58079ed9f1d54328f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 5404 bytes
font_01_sfnt_off0001215c.bin
95cee2a2d9ba0220790edd1913be9fa484c41c9479ef6f68704487edb3cf4f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 11844 bytes

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