Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c21e7232a65514d…

MALICIOUS

PDF

89.9 KB Created: 2021-02-21 23:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5d1b10d966deadcbe9af9e1364c4580a SHA-1: bf635714f9ac1ce6602d33ea1beddb941e233fce SHA-256: 9c21e7232a65514d9eae7fa76e6fa0754df1f4f2045afdf55f8457cf489b2150
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://bologen.ru/strik?utm_term=ragtime+doctorow+stylistic+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fec7b7635f05.pdfIn PDF document text
    • http://counterman.ru/come_dine_with_me_episode_guidejolt3.pdfIn PDF document text
    • http://my-favshopg.online/tuwefy0l0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496815/normal_6006323b6b742.pdfIn PDF document text
    • http://delaem-sami.online/driving_test_study_guide_canadanaqpo.pdfIn PDF document text
    • http://getcreditcheck.info/road_trip_beer_pong_mp4_moviez0emp.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/pujujixetexa.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/Orijtii/36708857697.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/ugiWgfr/78571543238.pdfIn PDF document text
    • http://xtrading.buzz/paradise_lost_book_1_poemr2xdt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_5feeb78424001.pdfIn PDF document text
    • http://trynutra.shop/33448299798sb438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458628/normal_5fcf4491e8cf5.pdfIn PDF document text
    • http://tk-time.site/ubiquiti_nanostation_loco_m2_setup_access_pointojk8t.pdfIn PDF document text
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/foligux.pdfIn PDF document text
    • http://silvanozito.online/didazurog0ezlq.pdfIn PDF document text
    • http://businesshelpservice.com/secugen_hamster_plus_biometric_software_freeux93a.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_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 5460 bytes
SHA-256: 3943de16a5380035b14fab667495cb9720dc103ada0af91f5120e2f1ae090d4f
font_01_sfnt_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 10860 bytes
SHA-256: 53fc7d82baf82cb7866d4eeda0104740cf9cb382376f23517d0104ce74a8abb2

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