Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f277b15e7001ea…

MALICIOUS

PDF

82.3 KB Created: 2021-03-06 02:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: baf90aed52a358252bfc594d25fd28ca SHA-1: 6b1aefe03843cf58eafae3f22d9b9c3d75e8008e SHA-256: c5f277b15e7001eac386a89542eea98149b15728009c4d4f6cb3cd823b4d5ee0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a misleading title 'Math workbook for third grade', which is likely a lure to drive traffic to malicious or spam websites.

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 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://jacksth.ru/award?keyword=math+workbook+for+third+grade PDF link annotation
    • https://cdn.sqhk.co/pulovafafita/Uyifjdt/warzone_tower_defense_hacked_unblocked.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/how_to_use_cuisinart_2_qt_ice_cream_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/nsjfjee/dofon.pdfIn PDF document text
    • http://xelipev.22web.org/gangstar_vegas_offline_game.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/9682320.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/dde13bd2c.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jg2ggrw/guide_car_restoration_3d_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/hhCfRAo/mogezurunejuvolekuladip.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/84522.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/Ogcbhi0/10969601877.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/how_do_you_service_a_husqvarna_sewing_machine.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/mercruiser_5.7_service_kit.pdfIn PDF document text
    • https://lezisonesu.weebly.com/uploads/1/3/5/3/135339892/nafewa.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/PAjblZC/71018721493.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/muvemasoxaji/blechtrommel_buch.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/atopic_dermatitis_guidelines_aad.pdfIn PDF document text
    • http://vivotes.rf.gd/restricted_airspace_sectional_chart.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/53223332975.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_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 5260 bytes
SHA-256: 0bc99a3162a6ed630caa5863edf91b09dd5787de0d5a8cc5b68c359aaf414852
font_01_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 10212 bytes
SHA-256: ec95118a6d9779c5269d47d05b2a49dcd784c3b6e4517b3bd76c2968871d0cef

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