Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00532b7bf45c97f…

MALICIOUS

PDF

66.6 KB Created: 2021-02-28 07:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 37fb10d2db5a9dfc7004ba6efa87f9a9 SHA-1: 5f5dcfd5b3086260c7b11d5da1b7f202952b50ae SHA-256: a00532b7bf45c97f26e42399b1a6bd19c2865fcbb663be642dc6f9eac78b965f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to direct users to malicious content or phishing sites. The document body, though heavily obfuscated, contains text related to 'ukulele tutorial' and application metadata, which may be part of a deceptive lure.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=one+call+away+ukulele+tutorial PDF link annotation
    • http://rexuwoxaga.sportsontheweb.net/spectrum_math_workbook_grade_6_answer_key.pdfIn PDF document text
    • http://kuvonej.iblogger.org/bavuxukafizulutufamusire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_6037ff47c41ce.pdfIn PDF document text
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/nesadosuxarefavutak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5ffe4a91a6d54.pdfIn PDF document text
    • http://sosefuxewaduta.iblogger.org/3531544531.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/dd_beyond_custom_classes.pdfIn PDF document text
    • https://rujenamifib.weebly.com/uploads/1/3/4/6/134652207/buvizoz.pdfIn PDF document text
    • http://wiruribadusa.iblogger.org/azur_lane_javelin_equipment_guide.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/kedijokowasuvebasarafipiw.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/everstart_maxx_3_amp_6v_12v_automotive_battery_charger_bc3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipixerokofor.epizy.com/dojolupi.pdfIn PDF document text
    • http://kesobikifa.epizy.com/27295616091.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/stihl_blower_repair_parts.pdfIn PDF document text
    • http://kupikobu.epizy.com/adonis_golden_ratio_training_program_free.pdfIn PDF document text
    • http://siparedobapu.rf.gd/wuvepepapuwesebilutazozab.pdfIn PDF document text
    • http://zonizuziguzapi.rf.gd/cpm_geometry_answer_key_chapter_4.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/bofavojizal.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/bazigar_o_bazigar_song.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_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 4900 bytes
SHA-256: 3a66660546b3cb14572519e7e150f7ee35102dde2f4ce1db67681473946d9807
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 10056 bytes
SHA-256: 4c084ccd24a5db7240e907050164d19cc14b9a97e684af046793222778a98216

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