Malicious PDF — malware analysis report

Static analysis result for SHA-256 6679a1dddefb80ae…

MALICIOUS

PDF

73.6 KB Created: 2021-03-03 17:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8765183282e70b8f3984305ac5e37b7f SHA-1: e37733b099513e6b88f382c645b765d28d4c1c2e SHA-256: 6679a1dddefb80ae3075b6690949fef3d6237edd63652ada110685a4d21f6f30
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, with several identified as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though partially obfuscated, are consistent with attempts to redirect users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 4

  • 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
  • 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://bologen.ru/award?keyword=health+data+analyst+certification+programs PDF link annotation
    • https://cdn.sqhk.co/pujalabasi/h4jagft/lozasab.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/kufotojiruxap-wafezuxabilofa-xabowevekaziwa.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/c6Dz3IM/carrera_slot_cars_sets.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/30448382372.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/tower_defense_simulator_roblox_live_eventhg9e2.pdfIn PDF document text
    • http://qunit.space/risunusoposevubujtyjj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393369/normal_6008969b1ab45.pdfIn PDF document text
    • http://eurozone.pro/89118910721x6u3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499299/normal_5fd809c75d1dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5fdcfe59355cd.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/ieiaFsN/96536522288.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/hj7jiIn/90409347624.pdfIn PDF document text
    • http://senteber.site/wugomagigimoxoreritel00uon.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/jewizopukuni/carbon_cycle_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/4501338494.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/how_do_i_connect_my_hp_officejet_j4680_to_wireless_network.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/neromuzutagasuzuzedun.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/how_long_to_cook_chicken_on_infrared_rotisserie.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/project_report_of_cattle_feed_plant.pdfIn 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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 5632 bytes
SHA-256: 4b93641b137dc0aea1368561cedd8756460d87687a3d305711b478cc918dcfb4
font_01_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 10228 bytes
SHA-256: 333c011bb02dd36874ec6f50f1a63603bb323986ba1c866d99f037f847182f41

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