Malicious PDF — malware analysis report

Static analysis result for SHA-256 83504db085ca665f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 17:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5fa3891ae5a3eb571507baad3512b113 SHA-1: 94d31797dd9668e7bb6beb4132ccd4f790c5fd0d SHA-256: 83504db085ca665f1889a03cdb2c863ddd3b4dddf00e5bf418fc050a5f9a0486
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://kuzutuzo.ru/strik?utm_term=how+does+a+record+player+needle+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402501/normal_60492c9062b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6022b8b124249.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/UrSimia/woxobopukeniberelag.pdfIn PDF document text
    • http://lupepujalin.iblogger.org/tazevowepemuguwagide.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/sch_binh_php_tn_t_v_36_k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_602597d87e551.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/b4ijFhe/krome_studios_twitter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_5fd1f17d3424f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_603c2e3c66edd.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/pogisusodopuxovub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/casio_g_shock_rangeman_black_panther.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/how_to_rekey_kwikset_keyed_entry.pdfIn PDF document text
    • http://felepav.epizy.com/ps3_emulator_android_bios_file.pdfIn PDF document text
    • http://jizoxofude.rf.gd/all_bengali_serial_app.pdfIn PDF document text
    • http://meguwuzib.rf.gd/tuzinebekanuladutexoko.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/conversion_of_units_in_physics_worksheets.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/amharic_music_lyrics.pdfIn PDF document text
    • http://rilexukalenenig.rf.gd/gps_garmin_255wt.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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5288 bytes
SHA-256: c379cacd1150d15ee6e217aa0a7102810c671b441f46d50c73df364ac9f537c8
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 11572 bytes
SHA-256: 5448cfc3e1f777b68f438a7c425dd7bda09967ec8a3db33159f848b447721a40

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