Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbd66c11b8afe91…

MALICIOUS

PDF

75.3 KB Created: 2021-02-14 13:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e95d76e7b20c9f1c7cdefb7c2de6a40 SHA-1: f4f7cc8c75e08bc95af90c714797721d6d408b63 SHA-256: 3cbd66c11b8afe91cfa946c0216159d819ea9fb3129af33cdef9e796a31bef2d
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though partially corrupted, contains keywords like 'horse haven cheats ipad' and 'account will be terminated', suggesting a lure to trick users into clicking the malicious link.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/123?utm_term=horse+haven+cheats+ipad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390996/normal_600e4c53585ef.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/dCrjbia/zemopenisexelabaze.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ohiGNhe/mubivenuvula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fe1b5bcb5e0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5fe3418c1bec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_601d21e83c292.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/fojbjhu/pisulupomuzizevus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_600d8a315a4ef.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/mUq0mih/rwby_yang_x_male_wolf_faunus_reader.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwusetokabozil.epizy.com/fudetezet.pdfIn PDF document text
    • http://jusudab.epizy.com/kenonofanulori.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/quotation_template_excel_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/telecharger_cambly_apk.pdfIn PDF document text
    • http://kisitibonadal.rf.gd/6944650514.pdfIn PDF document text
    • http://larafegarinev.epizy.com/michelin_guide_france_restaurants.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/cima_updated_per_guide.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_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5152 bytes
SHA-256: ed85e642ceb8fe5a525b1d938537cdff8265c3f200c48e379cccf4be4b1d29d0
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 10936 bytes
SHA-256: e700e4dd2788b1cc858ec2d117f062de61ea44293ac4b44fb3ccad05006d92f0

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