Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9f801d555dbaf6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 19:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ef21a514f3ddf36d111d8d19372a2720 SHA-1: 2d0f880a39b8cfa2a2f4f2a431a8974a9544e741 SHA-256: 6e9f801d555dbaf6ca9d0009257105951aa06dc05b3071b247ca2d1ab4cb52c0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=define+idiom+behind+closed+doors PDF link annotation
    • http://bu-markett.com/699660514007ng57.pdfIn PDF document text
    • http://pewodaz.22web.org/54057295572.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/7e2b442.pdfIn PDF document text
    • http://cmb-eco.com/57363738076p7jg9.pdfIn PDF document text
    • http://intekzafast.online/poperulirogebejedadezbjip0.pdfIn PDF document text
    • http://temppicture.xyz/bose_cinemate_series_ii_remote_control_appwhmdj.pdfIn PDF document text
    • http://besuxiju.22web.org/metabolismo_del_etanol.pdfIn PDF document text
    • http://makedctl.site/dgx_640_used_price8kb4z.pdfIn PDF document text
    • http://salonlabs.xyz/6541363862410bij.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/9930645.pdfIn PDF document text
    • http://gutprod.xyz/araba_yar_oyunu_apk_hile_indiry6sp1.pdfIn PDF document text
    • http://trydouche.xyz/87406037517scxtv.pdfIn PDF document text
    • https://zesudegefomoga.weebly.com/uploads/1/3/1/0/131070027/e7593a.pdfIn PDF document text
    • http://retys.fun/bseb_ofss_inter_11th_admission_form_2019b1bil.pdfIn PDF document text
    • http://ninefuva.22web.org/mailchimp_subscribe_form_link.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_306f9083788c4d83b7606b00afdccc01.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_154bc0b5dddb4cc28261b07c926f49d8.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_acd30812bf5d46c4b26cbcbbf05241bc.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_11f3a2ec5b63482e9cb3b0c923a1fe34.pdf?index=trueIn PDF document text
    • http://vuvumotelikev.rf.gd/spectrometer_lab_report.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_53711f1d8b2e4ae5bbc4f3180f44b71b.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_465b95f412064fc2bd1af46bc5af836c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5188 bytes
SHA-256: bd35b1e4b8a6d2e9f1e28b175532718d085b003a981ee6cf4ab30292a0b35073
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 12048 bytes
SHA-256: f5bfdeea4008fa652885cebbf198f13bc7c65bc7d416bd0e3692105ebba48460
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16120 bytes
SHA-256: 8e14c86fc3b8b6015485dd2dc55534c1d318ca6e4ce8cbcdacfdcd8f7eee4c6b