Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7e8330f439d19a…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 19:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 411c71f6b0f40881ffc056efb8a12e21 SHA-1: 6c4e59476e603e5da3f4e47925494d5ccb97541c SHA-256: 8c7e8330f439d19af68e2ba1b7deebb1124f8eee466e249bb8480c05550e66a4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=maggie+a+girl+of+the+streets+chapter+12+summary PDF link annotation
    • https://cdn.sqhk.co/vonofuguniti/ZggVhin/business_impact_analysis_easy_definition.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/jixizu-degixaxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/oge5ohc/african_crawler_worms.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/jJja7OD/tomb_run_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/aVjgMXA/37147651956.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/Hzijljh/burgers_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/vekotevudoze/bdlrJ1R/takeout_central_asheville_coupon_code.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/vasilirabuliras.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/Qhfjdgd/wekilok.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/jiwichj/french_style_nails_pinterest.pdfIn PDF document text
    • https://negazebofukiwan.weebly.com/uploads/1/3/5/3/135318678/duzubegikax_moran.pdfIn PDF document text
    • https://cdn.sqhk.co/fiziroluj/bMidCgj/89706208773.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/dafumuxitupav/qu_son_las_ciencias_formales_y_empiricas.pdfIn PDF document text
    • http://lemijafuw.epizy.com/free_behavior_chart_template_for_parents.pdfIn PDF document text
    • http://vedanasori.rf.gd/baphomet_tattoo_template.pdfIn PDF document text
    • http://jusarim.epizy.com/maniacs_2001_full_movie_free.pdfIn PDF document text
    • http://rikonobawo.epizy.com/rijumelakog.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/24602293414.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/8358508925.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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 5720 bytes
SHA-256: ac1793aaf93a55d56bddf4c6e15ba6023a6ac145617cf283bf5262fcd349f49f
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 10760 bytes
SHA-256: 9489e597e6fa0294560b49c6d622b2603499456ba1224190db32fe9204a5e9ae

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