Malicious PDF — malware analysis report

Static analysis result for SHA-256 1566f3b517ca112a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-23 10:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97857c0b604199a1f17dbc4edee9d150 SHA-1: 8d441a6323f0192da3627ee4285c3173d335809a SHA-256: 1566f3b517ca112a4744f1b8458013e3d0b64acd975f9e5b3b2dd9af067e9381
126 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, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to search terms like 'skyline decks seats target field', indicating a potential phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://bologen.ru/wix?keyword=skyline+decks+seats+target+field PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5ff89b8965394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bcd0b2e67.pdfIn PDF document text
    • http://worigozuwujuva.iblogger.org/app_para_baixar_musica_no_android_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/jgjNEEw/driving_school_near_me_for_adults_only.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hcdPK4X/zedetibotidugoz.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/1731845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_6011efbf4627d.pdfIn PDF document text
    • http://mobapur.iblogger.org/how_to_tell_if_your_oven_pilot_light_is_out.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fd371048c3c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5ff82792d9ece.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/3676740.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/323jh2V/52506384930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warurodezum.epizy.com/google_calendar_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/nifubuderekoka.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/maya_3d_animation_software_free_download_for_mac.pdfIn PDF document text
    • http://dovevane.epizy.com/kuruvodikinekijonibu.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/baroque_concerto_ritornello_form.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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 5460 bytes
SHA-256: 89e21ca431bd3a7dd5c4e32829caa897735dc6faa04d11b965fb0d6a59c5fc2b
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10476 bytes
SHA-256: 4f7633345ce37287f051f845eedab41959395ba634ffa0e286588966164994d3

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