Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3b9f0f4b0f6f34…

MALICIOUS

PDF

69.5 KB Created: 2021-04-01 03:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 345e054a40324debf8f25a0ffe798ecd SHA-1: 1cffd880b61f1fc6e9e105f187e9066400dabcfa SHA-256: 4b3b9f0f4b0f6f344b38b3d8362eab0b3b8c8ac12b874bb3232eb3a87ecfdd33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://dafemum.ru/123?utm_term=volume+of+shapes+worksheet+tes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369496/normal_602a6e5b95d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_603bdd3cd2564.pdfIn PDF document text
    • http://mujezixebu.22web.org/84603843565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_5fe68854daf88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_60154756de21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_6017def0bc155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_600f978e63346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_600bf1dc18e43.pdfIn PDF document text
    • http://jotipire.iblogger.org/42043636373.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/pavatoxevurojeloj.pdfIn PDF document text
    • http://karavaxix.iblogger.org/navutudodobawufosikota.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/sazomo/iec_electrical_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/holotropic_breathwork_guide.pdfIn PDF document text
    • http://jedafalakax.epizy.com/texas_instruments_ti-nspire_cx_cas_vs_hp_prime.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/10681537168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8bbd98-963d-4fe2-bc03-574f03284e61/what_is_fluid_dynamics_in_maths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d0f630-d604-421e-97b2-678825a117f5/wumefam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e54f79-181f-4e79-8e74-15950bd5031d/sikegisegineb.pdfIn PDF document text
    • http://bazejufojowopor.epizy.com/57732081087.pdfIn PDF document text
    • http://pepiretivixu.epizy.com/33257105687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9f65e2-00d6-4037-b2fe-e3ce31c288a1/what_does_the_heart_symbol_mean_on_blood_pressure_monitor.pdfIn PDF document text
    • http://natetiko.epizy.com/aire_negro_agustin_fernandez_paz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8dbebb-27f9-41a2-acb0-8b54bc13490e/nikon_dx_af-s_nikkor_55-200mm_review.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/sentry_safe_lock_box_1170.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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 5264 bytes
SHA-256: bb3f013c2ac4ecfc8999ccde28ea2fa0ce8fd281301a9d09d0765a63ab2f33a6
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 10236 bytes
SHA-256: 6b3d021fba2ca4b1daf91338b09c3d38837769984a1fcfdcb4ed72d4d3373466

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