Malicious PDF — malware analysis report

Static analysis result for SHA-256 612cad0994c4b515…

MALICIOUS

PDF

71.4 KB Created: 2021-04-24 01:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 402f3dbcb544816465904fb72aa31da0 SHA-1: 2117ab95de88981c3071eecea897db3bfeeed31a SHA-256: 612cad0994c4b515d63961773e19a10396b6d5ad7f8b016ff19bfe239099e623
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to zajinet.ru, disguised with a search query. The PDF's structure and the presence of multiple external links suggest it's designed to redirect users to potentially harmful content or phishing sites, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=safety+glasses+with+bifocals+near+me PDF link annotation
    • https://cdn.sqhk.co/laloropaki/jVgigfu/x_cannon_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_604ec0295adb7.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/g72jajf/small_world_film_zwiastun.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/nogobafudakedo.pdfIn PDF document text
    • https://merezedul.weebly.com/uploads/1/3/0/7/130739463/20f0ed68935df.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/vhftfii/soccer_football_prediction_bet.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/biiDjeC/99006747382.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/BhaE39z/music_visualizer_video_maker_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_601aef494d476.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/raxipi_wuvobigiviximuw_gufuwa_tukomup.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/XOjagdG/care_home_manager_salary_wales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_60247bec8e08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_5fd719dd7b149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417653/normal_604ee67d72bc3.pdfIn PDF document text
    • http://opt05.ru/39754759771yz8u7.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/jkhjgfF/super_pk_aptus_avis.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/spoon_river_belhaven_nc_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/company_analysis_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/iq_test_questions_and_answers_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/adobe_illustrator_draw_tablet_apk.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 5732 bytes
SHA-256: c0f085c7c6e9c2ed70cf5573e155b0a85468b6ec19bb694c152a65418933ead7
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 11532 bytes
SHA-256: c9823145f6ebfbe9466f4519531d98a1c9201c77d264828b5ac363f825d1afc4