Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eec2ecb9d9043d4…

MALICIOUS

PDF

77.3 KB Created: 2021-05-10 11:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8101296c075d84ff1e42bf3b29787c5 SHA-1: d5b5c8ad18a15efaf8b3aeae38db78cf5a70a947 SHA-256: 6eec2ecb9d9043d458176d83b81f15dc005793147063d082f1243a0eed1dd403
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document is designed to redirect users to numerous external URLs, potentially for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=the+house+with+a+clock+in+its+walls+mpaa+rating
    • http://dress-russia.ru/nufalavipolovojedavunavi5hxrd.pdf
    • http://fitokapss.xyz/parts_of_speech_notes89577.pdf
    • http://lodemazupunogas.iblogger.org/giancoli_physics_for_scientists_and_engineers_with_modern_physics.pdf
    • http://insurancecarusa.com/apollo_twin_x_usb_vs_thunderbolt11d6u.pdf
    • http://8bitbeardsco.com/27307832242nstcn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc08059a-f915-434e-8b71-ba482593239d/gomurudiravatiwalowumat.pdf
    • http://kebanibaru.epizy.com/what_to_expect_during_a_home_walk_through.pdf
    • https://s3.amazonaws.com/medaliwifufugel/how_do_i_turn_off_call_forwarding_on_my_panasonic_phone.pdf
    • https://s3.amazonaws.com/pokorevalaxex/innisfree_pack_mask_sheet.pdf
    • https://s3.amazonaws.com/gizonukorad/crystal_report_viewer_sap.pdf
    • https://s3.amazonaws.com/jolozidabi/43718309164.pdf
    • https://uploads.strikinglycdn.com/files/5baa5ecb-2d5b-4257-8ce6-9db58d52135f/23443150406.pdf
    • http://rowurujo.epizy.com/lovoforanev.pdf
    • http://bununosaj.epizy.com/programa_fiestas_benicarlo_2020.pdf
    • https://s3.amazonaws.com/kegovev/20966548945.pdf
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_cae76900b24c4d2ba3d9e7716c096575.pdf?index=true
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_2d4b47d5642c46288fc8c89ff9982c0a.pdf?index=true
    • https://s3.amazonaws.com/woxotopapozokev/britax_marathon_clicktight_installation_rear_facing.pdf
    • https://uploads.strikinglycdn.com/files/1933175d-6eb6-4b4e-ae8b-46e1b782c0f6/wikelola.pdf
    • https://s3.amazonaws.com/zuwimadaneb/the_only_sales_guide_youll_ever_need_free_download.pdf
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_b6386924fc9743deabff0905d1cd32ec.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_off0000efea.bin
0b629defe2c4f7f0f6bd407be09532cae72647105347547b0a41400ad894666f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 5452 bytes
font_01_sfnt_off0001025b.bin
5e9e9b27a23a9ea528281441478f4bc5614c05c662b926d93170be13a047b453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 11076 bytes

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