Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacbdf5b5626d74c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-24 05:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0417098156818759ba1965e277f3dce8 SHA-1: bdeb7f305fa7fcfd4b8c9afc7636e917da4f0ba7 SHA-256: dacbdf5b5626d74c3acb77c108d5a708f405005b59e7a3f78c0a5f40984b1275
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=mca+item+sampler
    • https://cdn.sqhk.co/segidexu/iiCibjb/voicemail_settings_on_this_phone.pdf
    • http://nagaxutunasom.22web.org/kenwood_ts-480sat_operating_manual.pdf
    • http://smartcreditus.info/32792340904zunsq.pdf
    • http://bumasujofoj.getenjoyment.net/what_elements_are_in_palm_oil.pdf
    • http://iuts.space/how_much_time_required_for_gmat_preparation0krc9.pdf
    • https://cdn.sqhk.co/roretuduva/ihWhhgJ/15978994758.pdf
    • http://therarbooks.com/how_to_reset_camera_on_macvxtok.pdf
    • http://zigamesixeviru.22web.org/11647154483.pdf
    • http://azakalaza5.xyz/machine_learning_data_science__deep_learning_with_pythonsj9hu.pdf
    • http://ag-management.space/burris_eliminator_iii_3-12x44_for_salet9kpm.pdf
    • https://cdn.sqhk.co/tazakabebilo/chdrTJh/86852609338.pdf
    • https://cdn.sqhk.co/wojusipi/DhiTijv/raju_rastogi_interview_meme_template.pdf
    • https://cdn.sqhk.co/sozaxejiv/aRcjaMt/14138892421.pdf
    • https://cdn.sqhk.co/potasuregoz/diblTia/4277407534.pdf
    • https://cdn.sqhk.co/tavikalamo/ggdR87o/leguwofuriru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_0a57cfc899154c3fae4506fe0c87d068.pdf?index=true
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_adbba005b6d142cba060c49b8a2931df.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_77bd5e901ab9443fa9104368d46798bd.pdf?index=true
    • http://bavidoripo.epizy.com/sedadakafoledus.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_4453811e0b234b8f91952e6141671159.pdf?index=true
    • http://bugazepoja.onlinewebshop.net/28231116276.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_661f9a6e2beb435a9d95bde739a612f8.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_off0000dfb5.bin
4f9af4f9dae1a239bdead30a6d19599b115b98f880084b5c0ea521dd35db38f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 5084 bytes
font_01_sfnt_off0000f0ee.bin
5f43ebdbee4e7059ae3801937825f5e1daa2088053c034f9796dffd1a28091d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10332 bytes

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