Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa771b9f5de876…

MALICIOUS

PDF

71.4 KB Created: 2021-03-16 20:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b98c68e3c826b0d01df8483d7511a0f0 SHA-1: 4f04c3d2de48c663d7fe52a3901da6ba3f7ac56d SHA-256: a3aa771b9f5de8764729802eacd9a974e0c030b8ac6a7790529cd32353c1489e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, suggesting a phishing or SEO manipulation attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=jimmy+c+draughn+high+school+football PDF link annotation
    • https://cdn.sqhk.co/mivijigonof/eytf5hf/xivususabesag.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/8hiGhaX/how_to_acca_membership_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/Kiieiix/34295859567.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/gQibuib/star_wars_hyperspace_mountain_disneyland_paris_review.pdfIn PDF document text
    • http://netewe5.xyz/gioteck_vx_2t88ra.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/n2Phh3t/whatsapp_setup_for_pc_windows_8._1.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/4383012309.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/gosikow.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/jdBGchg/pixel_gun_battle_royale_weapons.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/30431605966.pdfIn PDF document text
    • http://bullbananavannaone.xyz/lujezerudemokum72gp6.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/3644510.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/acidosis_lactica.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/icVl1WV/mx_player_android_11.pdfIn PDF document text
    • http://nanolenka.xyz/lochinvar_commercial_boiler_reviews21iwd.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/xalilex.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/qoooIie/magical_girl_dress_up_deviantart.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/fuzafuzeruwit/xapebajekegukamezan.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/85537275970.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/60170084361.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/gogezokuvuwulezopi.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/sujukoder.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/eco_green_template_wordpress.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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5668 bytes
SHA-256: 973958a612f74a83fbcd0d560260c3bdcf9ef077de5a505c7067264879cb87f2
font_01_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 11664 bytes
SHA-256: 4676ae6831cdb55b4cb7ad8d1a32f202c320a0bafdf9251e129c87036e1cc252

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