Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7148b67dbe3a9b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 06:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ad2d000e920e627193ab39271332e30 SHA-1: a8357b508a5469b7ff5803126274675924e73467 SHA-256: 4e7148b67dbe3a9b47b18a75195cf5027203a01a8e1d9a5b99c4115711c8acfa
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=boogie+woogie+piano+free+pdf PDF link annotation
    • https://cdn.sqhk.co/genazeres/hdPiiIK/smartmask_mascarillas_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/jdp3gcV/50990050256.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/Mgdjcgd/fake_nails_summer_designs.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/xukotupisaxojawez.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/jjdYZtj/36228601314.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/gPmiehi/the_wolf_of_wall_street_full_movie_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_604cca238f3c0.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/bukaliwav.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/jchcgf6/pofusubuvirasob.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/zT3iiTl/vw_app_connect_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_600fe6db12049.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/8fc823b61a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6182222ea0db484d9a9be07a1c652f3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/24417124999.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/irs_publication_17_2016.pdfIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_057c3e2525a44198bfc64a8802accc9e.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_ab1c76c48c9947a1ae2806fb7fdcd869.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_8a4876fa7e0845b8aee3f39f0643de89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/cash_flow_statement_template_ireland.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5140 bytes
SHA-256: ba751a3825b120a1461f10f22727918b1281538324810867af09532671780506
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 11460 bytes
SHA-256: f99a3901b71b4596424abac07a215bcbf5d88b4552a0ec938e9f9f05c48aa5ef