Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9604a2905b00c72…

MALICIOUS

PDF

72.1 KB Created: 2021-04-05 14:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 069e96dcb093ff72b4884a555f106a79 SHA-1: 8b5375bf81fd640082b12f87aac351d4a7999f62 SHA-256: b9604a2905b00c7288fde6220a6090d3ec6a299869f23989ed2eba0c7a5626da
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=howard+miller+pendulum+wall+clock+instructions PDF link annotation
    • http://item-mask.top/multi_point_cutting_tool_nomenclature4um4x.pdfIn PDF document text
    • http://smm-target.ru/misunawuwisidaragafo7h5ud.pdfIn PDF document text
    • http://thedefenseforge.com/how_to_use_shark_professional_steam_pocket_mopgbawq.pdfIn PDF document text
    • http://creditscorehelp.info/pebuluforudszqxr.pdfIn PDF document text
    • http://securityverifiedservices.com/commander_deck_rules_magic_the_gatheringv9yb0.pdfIn PDF document text
    • http://dfds.in/que_es_el_equipo_de_computoeqt7q.pdfIn PDF document text
    • http://shopyou.online/rumiler0t57u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botusomiwa.epizy.com/13507177242.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/99042649380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18d9568-8363-4b8d-999b-8d4c7d4264c3/jeux_de_carte_le_spider_solitaire_gratuit.pdfIn PDF document text
    • http://daxafedijumexir.rf.gd/rokil.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/visiting_card_psd_format.pdfIn PDF document text
    • http://kopididutal.epizy.com/35890694886.pdfIn PDF document text
    • http://wosekamilos.epizy.com/94514962333.pdfIn PDF document text
    • http://tazolupiviroliz.epizy.com/aachen_travel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8b5b40-fecd-4234-8876-c46886d195be/do_horses_die_from_broken_legs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3684ed43-2005-4559-8960-0fb10ea98c6e/kenmore_elite_steam_dryer_not_heating.pdfIn PDF document text
    • http://ravuwuvilusu.epizy.com/89928909742.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/vedic_astrology_apps_for_android.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5336 bytes
SHA-256: cad964f63ebd2a1cfe091dd4e4f20efd479b9bab5a6c1f16e158734eca0405b2
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 11152 bytes
SHA-256: 873df976045f12b2469c231d37a6537c7758a864187535df125e6169f1e25f37

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