Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00890c40381003b…

MALICIOUS

PDF

78.5 KB Created: 2021-02-27 23:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 749990458c203600bfd99e59146d26bf SHA-1: 5708ef6aadec329c28af7ccee78c9d782fa340bb SHA-256: c00890c40381003b007d2e2e161d8ec392c6447c48ff534c59e49a4c067746ff
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external sites, with several identified as link farms on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious PDF creation. The presence of multiple external links suggests an attempt to redirect users to potentially harmful content.

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://fokemale.ru/wix?keyword=saturn+transit+dates+vedic PDF link annotation
    • http://arbitestpark.xyz/55966827628d6oxi.pdfIn PDF document text
    • http://jaziroluren.iblogger.org/momijezixelexokakuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5fd3cc4c2158d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601e18eab490d.pdfIn PDF document text
    • http://iqecoportal.ru/anions_are_formed_by_non_metals2ikv6.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/porque_es_importante_la_inteligencia_emocional_en_nuestras_vidas.pdfIn PDF document text
    • http://detalives.22web.org/the_concept_of_the_political_expanded_edition.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/gugujezomefel.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/how_to_mount_garmin_edge_530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_603418e470bfc.pdfIn PDF document text
    • http://wuzaguwomu.22web.org/69403016318.pdfIn PDF document text
    • http://taher-tcac.com/olympus_vr_37042v4v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwemanuwixam.atwebpages.com/black_and_decker_steamer_rice_cooker_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/vexeferililozebiwobuboxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/datexoko.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/launceston_city_council_recycling_guide.pdfIn PDF document text
    • http://potimafekun.epizy.com/how_to_learn_day_trading.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5064 bytes
SHA-256: 89fbb3c8abeef19901fc94d17878cb3cbcc6b901df5318dd5dce3ee375b008ad
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 14512 bytes
SHA-256: 3c02b943fe3317aef87f7561d9fdebe73d89cedb298e55944453a63aa5fefc55

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