Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b65af1304c07bc…

MALICIOUS

PDF

76.8 KB Created: 2021-04-08 10:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 303e447970452a8a097e6de0004b852a SHA-1: 4d3af22d882f4291498d01fae9654f362b48be42 SHA-256: b1b65af1304c07bcfc781a2ae244f8d80e28e0c56ab2e26a987591690e87567e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=yoga+anatomy+spiral+bound PDF link annotation
    • https://cdn.sqhk.co/wofazexej/hfic7gj/cartoon_videos_app_store.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/pierre_bordage_les_derniers_hommes.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/army_football_schedule_2020.pdfIn PDF document text
    • http://itdiscount.info/lisiraropewunuzr5ep.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/gYKgeyq/downloader_and_private_browser_old_version_apk.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/xinazeb.pdfIn PDF document text
    • http://dibiwarisogix.mygamesonline.org/contract_costing_solved_examples.pdfIn PDF document text
    • http://grigolia-studio.ru/7464182631r0nez.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/a2VOdbZ/94933944353.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/welding_workshop_tools.pdfIn PDF document text
    • http://job-finder.space/les_miserables_book_short_summarygj4vf.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/Xhcp4if/42959298008.pdfIn PDF document text
    • https://cdn.sqhk.co/fapebenu/hjaxjcU/84929220192.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/MeYhjNj/one_punch_man_wallpaper_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/idIMibo/68534696178.pdfIn PDF document text
    • http://idealica-italy.site/atomic_physics_books_free_download5azwn.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jXd0Aih/lawoxivubugetirip.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/ricette_alta_cucina.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/napoledunadigo/majnu_telugu_audio_naa_songs.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/47577040531.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/descriptive_writing_lesson_plans_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/eve_online_low_sec_mining_guide.pdfIn PDF document text
    • http://namezenidel.onlinewebshop.net/cancion_del_mariachi_guitar.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5484 bytes
SHA-256: 1c657cde12d918af1c5f9e1b572bb8319d55a3014ae8f36f57bbf2ec67aa42d0
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10936 bytes
SHA-256: 7e0f5fb3e1f5865d2a1674cecc0e82f84b847559b056f149481629efd9208fdd

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