Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad8ce43cfa80a86…

MALICIOUS

PDF

74.6 KB Created: 2021-03-24 11:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c271ef1d62e145cec102ab1c5f97950 SHA-1: 99d0125bc55cf57c5da98391df3020460fff87f8 SHA-256: 2ad8ce43cfa80a862270e25f0fc501a3d6dbadeaacbdb987f7b154f224677507
186 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 0.9991

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://jacksth.ru/wix?keyword=11+general+orders+usmc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365591/normal_5ffa4ccec2169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5fc9a80fb1adf.pdfIn PDF document text
    • http://mavito.online/garmin_oregon_450t_parts8fmvq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_60229388eb7f1.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/iiUjaxC/canadian_mammogram_screening_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/CbPEhgf/glam_rock_outfits_male.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/LGhchiq/vh1_behind_the_music_episodes_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5ffa2db99ff6b.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/2dd111fd6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fede3bbdcca3.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/gjfhjn2/82295958905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_603ecd7c4ebc9.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/supixetemab.pdfIn PDF document text
    • http://it50life.pro/nupenurizf1r4.pdfIn PDF document text
    • http://replyua.site/75957719735d77rm.pdfIn PDF document text
    • http://lg-copyright.com/marshall_acton_bluetooth_no_soundbnldh.pdfIn PDF document text
    • http://clebohets.xyz/definicion_propia_del_aprendizaje_basado_en_proyectos_abpwg5ja.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/jdggyFU/new_font_instagram_story_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601fab414de2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5fd76ec2ef2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5fcb6895a485b.pdfIn PDF document text
    • https://kekiwudegabute.weebly.com/uploads/1/3/0/8/130813612/2461271.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/8hdGCii/81754407253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_603a2e19e3e62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5216 bytes
SHA-256: 7d39cde5e0864645090e9e9b9b4d9fe91529cfc801c83b7d5f92f93eb760cd70
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10636 bytes
SHA-256: 67f4a765da77336e48bbbf82ffddf518d8121dc06f5345f351a9dbfffac09cd1