Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c33be8f01d4822…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 22:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3939b47f77499fde01f03f9693ecee89 SHA-1: 76e9b8736c360e43e38598cf1871e6e3911631fb SHA-256: 28c33be8f01d4822f2b302e9ec494682ce415b931898362a284f43d6ad552e66
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=beautiful+creatures+novel+series+in+order
    • https://cdn.sqhk.co/jitolado/jcjj8gj/tupilibigav.pdf
    • https://cdn.sqhk.co/zukasedu/jbp3haO/textplus_free_text_calls_for_pc.pdf
    • https://cdn.sqhk.co/lunemitibojo/hajeeaD/online_marketing_strategies_ppt.pdf
    • https://cdn.sqhk.co/jenojigise/L57iahe/17756809362.pdf
    • http://paripamivawe.iblogger.org/monujofeziwofaxunemunew.pdf
    • https://cdn.sqhk.co/nifijagik/Lhiogeg/wurez.pdf
    • https://cdn.sqhk.co/dodamewope/bdjdnj4/general_tso_chicken_meatballs.pdf
    • https://cdn.sqhk.co/kupuvikadob/0gcIiaT/civil_police_officer_exam_cut_off_marks.pdf
    • https://cdn.sqhk.co/motulobugaji/jihU0MB/23699507958.pdf
    • https://cdn.sqhk.co/kizofapekeku/1iaibqt/lathe_machine_parts_and_functions.pdf
    • https://cdn.sqhk.co/bilanogakiw/OrjhjiG/furry_dress_up_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ba99092-8f74-47be-807f-6177dde6584f/human_trafficking_in_the_united_states_essay.pdf
    • https://uploads.strikinglycdn.com/files/ea22d1d1-d5b2-49c0-9add-b01408de3542/raxuzo.pdf
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_19a474506e834d37bd70ee5abc287607.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3d2db499-c1a5-40dc-9d4a-8801225f97aa/how_to_do_time_management_for_students.pdf
    • http://kefabebabefi.rf.gd/38715078385.pdf
    • https://uploads.strikinglycdn.com/files/7490a4d4-dfea-4433-90c5-4a2c98b85d60/operations_management_undergraduate_programs.pdf
    • https://uploads.strikinglycdn.com/files/17874aa3-86f1-4982-a031-1d7be638723b/waste_king_2600_humming.pdf
    • http://botetuvixomidiz.epizy.com/30098486177.pdf
    • http://xofiketur.rf.gd/fleece_fitted_sheet_matalan.pdf
    • https://uploads.strikinglycdn.com/files/c0922659-d300-4e7f-bad4-0ecf1e3238d6/62638315385.pdf
    • https://uploads.strikinglycdn.com/files/d729bdc7-f906-43a0-88bd-fb3a777ad6a9/11377378587.pdf
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_b3955cfc66c84503b9df7fd9cb22a1ed.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_off0000f0ae.bin
2c9e42cb1d6e4f48d8ca2457c19b581b7cbd0181aa091204847dd20ce27ab61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 5124 bytes
font_01_sfnt_off00010231.bin
fd8b5701df92c945b53547a05c665dfbb44c4e4f08469b2cfaadf3181097f5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 10840 bytes

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