Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a7cc3421c99f43…

MALICIOUS

PDF

147.2 KB Created: 2021-04-07 09:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b01967c871d612267bd96274fabbe289 SHA-1: b8026d3efb4b8210a6d5112f2202faf7c8f0ebdb SHA-256: b0a7cc3421c99f4361d3cb3435b9513511665079f8dc885ca978cc7f3668f09c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://resalured.ru/wix?keyword=with+the+old+breed+at+peleliu+and+okinawa+portugues+pdf PDF link annotation
    • http://tdsevsvet.ru/fajidoxelavawpvba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_60296491c8f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_601bba2b1d053.pdfIn PDF document text
    • http://getbuiss.online/249631683933533w.pdfIn PDF document text
    • http://oblakova.ru/54421154542j8umv.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/Xi92E8O/blue_tie_dye_hoodie_and_sweatpants_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_6012189420425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_60294a7e14ad2.pdfIn PDF document text
    • http://pokupka.space/57629350790h6j9v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_606c978717bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6062f478b12fe.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/ewicTgi/hideaway_pizza_owasso_delivery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_5fdbe01d3c0ec.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/rDjeje0/colchester_sixth_form_college_student_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_603581301f737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_6f19fd6aa6e2442d995ac19287ef1ffe.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_c801f29071eb418f88ed0d39832187e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30f00ac-a11f-404b-b5ca-cfed6e71facb/how_long_is_osha_30_hour_training_good_for.pdfIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_7dad166df7a3483eaa3c463f00652495.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c82cd6-6138-4893-8e90-4a5b4b3d4901/john_deere_ride_on_mower_prices_nz.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_20aa2ef2a5ef401fa557f3847716afcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b0e8ad-5763-4e5f-a389-3d3fcb946cca/nuwatimexifezini.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_52161216bfe24d65a0b9f0afbf32031d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000204fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204FD 5612 bytes
SHA-256: 5f6645b22fa57efd81f2381e9a24eddb5c24e74b6b6b666a223dece8e33ea991
font_01_sfnt_off0002182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2182C 11264 bytes
SHA-256: afb6f101c11f644dff596a8af7fc8a185a962ae201c3ce89f4fa5bed2655dd5b