Malicious PDF — malware analysis report

Static analysis result for SHA-256 a703241aa59b4380…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 01:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 49f1d1dae61b4e2a7095a72c3eeea27b SHA-1: bb5096ae4e1776309bed0f8f4ecbb5b6cb9e112e SHA-256: a703241aa59b4380f4e6693f493c6089abfd5b184ee797a420b577c55090c860
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=plainfield+middle+school+nh PDF link annotation
    • http://bigswinner.space/13326946024t7816.pdfIn PDF document text
    • https://cdn.sqhk.co/vofudejobif/jjfZIia/takabaguvinoxagomowef.pdfIn PDF document text
    • http://termometr-medikal.site/92076565026lwin.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/dAJsWzP/super_mario_world_yellow_switch_palace.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/harry_potter_sixth_year_timetable.pdfIn PDF document text
    • http://lnstagramsupportlives.com/make_drop_down_list_in_google_sheetsnh34y.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/borawoxevosigaliginirinaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_b33229e0fe734a748e4a41d4fd0d078f.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_86d8a0340b9542d89e6f0ff476eedc6c.pdf?index=trueIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_6a52e977e2d348c098858007b0e88a69.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_04952ccdd7a9490e8c4310482ac6a643.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_4660f0a2aad9446087f13e4c2ced8df3.pdf?index=trueIn PDF document text
    • http://xibupafuvobiluk.rf.gd/zasujiluxixogafabezijaju.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/vodixirelimegeloxit.pdfIn PDF document text
    • http://xupaxemos.rf.gd/jutogagagaruxadowapaki.pdfIn PDF document text
    • http://mosasawimip.epizy.com/green_background_video_clip.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/24103410838.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_b3ddbf6358ba4d208819b5374bb37f07.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_a5c0a2e82a82428b88757006139dc7a1.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_1fe0a43ed6254ba1a65abc7e302e2970.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_a4f2bead823f4ec3a12d535718e477dd.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/dirk_gentlys_holistic_detective_agency_cast_season_2.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5168 bytes
SHA-256: fef831bb0fa0c8cb175e3ebbb94d434a6d4dde2b05fdababbd183733fc638911
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 10588 bytes
SHA-256: 3c2b41a5a4eb19d1ed9ad0d92d3623e8a044aee41f44bb8d7987b197769e6040