Malicious PDF — malware analysis report

Static analysis result for SHA-256 b649ae7be828d7f3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-06 07:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0a5eb53f05f471f7722e2d3bdadb8f0e SHA-1: 056b4166a25163000a0f7fa830824f2d70587d85 SHA-256: b649ae7be828d7f38065b1aacfb288584a1241e9256e552cb4bfbe1e4c43b5ca
126 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://seumenha.ru/aws?utm_term=how+do+you+do+1.1+numbering+in+word PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/oihidjf/pwc_cyber_security_newsletter.pdfIn PDF document text
    • http://madamzero.com/beyond_skyrim_cyrodiila49l8.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/hgknJfZ/lerigusa.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/virtual_table_tennis_pcpwjba.pdfIn PDF document text
    • http://dvestideyli.xyz/how_to_connect_iphone_to_kenwood_radio_bluetooth7cpjs.pdfIn PDF document text
    • http://maturibcgj.space/dexter_commercial_washer_drain_valvewadgv.pdfIn PDF document text
    • http://drenajkrasnodar.ru/tabla_de_valores_de_probabilidad_acumulada_para_distribucion_normal_estandarm6xzm.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/coleman_powermate_10_hp_generator_manual.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/asus_rt-ac66u_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa11a20c-494b-40c5-80de-4b3f040ea541/calories_in_el_pollo_loco_pinto_beans.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_b7585365fbdc4eda969cf6ace31cfd64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec387d23-d359-4342-95a9-949c9dc9dc76/poxepudexuxagugufiredaf.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_c4ec2249bcce439eb5efacd967841f98.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_0ef1bf9b552a4e36951447b6e809bc10.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_5f4047a75f1c4d17b4411c4e15bd781f.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_a4ceda5f28794b07a5120b7519009410.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/consolidated_balance_sheet_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6078ff8a-04c1-4563-843a-ff58ecc23159/gotapivawepavesele.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/44468528584.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/best_linux_distro_for_android_app_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2890d8-0228-49fd-a7d9-bea96cb731f5/hatha_yoga_poses_isha.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/bitcoin_mining_software_2019_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71025a6a-f390-4adc-9790-556ff7aa8ded/how_to_scale_a_figure_in_matlab.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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 5104 bytes
SHA-256: 70fea121cd0f8f243525ae74b02d1d2bb8c917c014c72fde817349a1f4ed50ba
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 10412 bytes
SHA-256: ce9adc47972272355c9250a816d0722ac8b836aacf63bb8e4bf50b54c445571d