Malicious PDF — malware analysis report

Static analysis result for SHA-256 9114223a2099d667…

MALICIOUS

PDF

79.3 KB Created: 2021-04-11 21:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c7a6618ec555c9192ac766b4fe0c14f SHA-1: 166d6514dd4ef46352ca41d15fb849027956d4a5 SHA-256: 9114223a2099d667badbea57c74d536108a5b9564875a8a935df43e0c66ebaa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains keywords related to research data, likely serving as a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/strik?utm_term=how+to+interpret+data+in+quantitative+research+example
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6026d526038c4.pdf
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/533071.pdf
    • https://wufopuse.weebly.com/uploads/1/3/5/3/135300065/liguludib_limoromazogifez_jezaw_pafejazipe.pdf
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6055b7f7e6d36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuvidokibet/how_long_does_it_take_to_learn_wing_chun_kung_fu.pdf
    • https://uploads.strikinglycdn.com/files/7192d685-5713-4626-b3a0-5216b1217888/fluval_305_canister_filter_specs.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_28ba72f293434b8683f926bfe0666953.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8e32658-734c-4435-b41d-c09e60ca603b/71326007189.pdf
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_c84a5c9a830e45979e1082f437c012bf.pdf?index=true
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_52fe15bc86f841a8908c7eacc362ba5c.pdf?index=true
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_e1dcd840eeb44658be1b52ccde75a2a9.pdf?index=true
    • https://s3.amazonaws.com/nalifij/tinkers_construct_modifiers_cheat_sheet.pdf
    • https://s3.amazonaws.com/palevijuj/gepeboganul.pdf
    • https://s3.amazonaws.com/gonima/26493514612.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_d9a583197c124771883b2ae8f0995c7d.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/26519041426.pdf
    • https://s3.amazonaws.com/posaxugidut/minn_kota_24_volt_trolling_motor_plug_and_receptacle.pdf
    • https://s3.amazonaws.com/dutimajizowa/iphone_smart_watch_price_in_pakistan.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb4.bin
0777ba1b53e84fa0a3868b380ba6c89290c758c719f86f24ea5b077403c24974		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 5620 bytes
font_01_sfnt_off0000f2c0.bin
64b119f3433df04565ba2144d58a4305ef36bbe7e37a9962c8f4a791492dfe44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 10808 bytes
font_02_sfnt_off000117ed.bin
0865ea5686e30d19842a941efae749c2e92da649021023aa876fc32c67f43dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 16232 bytes

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