Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc85068556286440…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 17:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eecb03a8d4f26cc78bfe9b933a6022c9 SHA-1: 51e42c23dfbc12b31f67a8fc46e0a0a8b7fa6fe8 SHA-256: fc85068556286440a70ce879256d589d5aaa2a7594629b82c560e2e309982dd2
194 Risk Score

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. It uses an invoice-themed lure. 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 0.9991

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/123?utm_term=expenses+entry+in+tally+pdf PDF link annotation
    • https://cdn.sqhk.co/jurugaguvedu/hejdU1s/archery_tools_ph.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/0igifp9/21566377635.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/1140187.pdfIn PDF document text
    • http://bobatukuxoto.iblogger.org/pabazuxaxawuzobanote.pdfIn PDF document text
    • http://somuvopavu.iblogger.org/consumer_reports_best_vacuum_hardwood_floors.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/Piis3je/gba_emulator_unblocked_chromebook_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/idKhfge/84092975310.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/7e733ab54.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/jThagNR/best_album_art_er_android.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/QAOAjan/free_car_accident_report_vin_number.pdfIn PDF document text
    • https://cdn.sqhk.co/gunusuxur/hbiLib6/vpn_apk_for_mtn.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuzoda/ejbfAcB/rusoluzoliz.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/jcjIgKN/android_marshmallow_lock_screen_widgets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidodurej.epizy.com/5699409360.pdfIn PDF document text
    • http://laboluvimaniraf.epizy.com/guidelines_for_ischemic_stroke.pdfIn PDF document text
    • http://toberijalija.rf.gd/29532390161.pdfIn PDF document text
    • http://fasitefikiseli.rf.gd/cloud_storage_platform_examples.pdfIn PDF document text
    • http://rivelik.epizy.com/20428362128.pdfIn PDF document text
    • http://voborimogixex.rf.gd/ratuxikibigadolife.pdfIn PDF document text
    • http://tipikirobis.rf.gd/62282381704.pdfIn PDF document text
    • http://dasuxasad.rf.gd/51078924978.pdfIn PDF document text
    • http://litekedewiv.rf.gd/pijogovitokad.pdfIn PDF document text
    • http://gefifeji.rf.gd/74786999367.pdfIn PDF document text
    • http://zomatur.epizy.com/novena_arcangel_san_miguel.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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5160 bytes
SHA-256: 6db0a5ff5121888af1bb01357583a137d9ad5a220d033c0728e685b4a4e73109
font_01_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10916 bytes
SHA-256: 335912b12d04526d586cb870720f7b813a224378f81ebcfb56e5172b1646de98

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