Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef137ec9612c042b…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 07:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 642135ffc13fcb895a8946c94cd3e08d SHA-1: 2e02ae0e89e0d8c3ba48ba2f98a740d2ebfb82da SHA-256: ef137ec9612c042bc84106c2aa6c97bf5d60d1d6fdaff8ac37add0580bb894ec
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct the user to disable security software, a common tactic in malicious documents. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://maypoin.ru/123?utm_term=what+are+the+names+of+crossfit+workouts PDF link annotation
    • https://cdn.sqhk.co/gabixeme/iciaiiu/dania_sandwich_tapas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_600ca868f0ac0.pdfIn PDF document text
    • http://hellesypakk.online/how_to_recertify_nasm4eri1.pdfIn PDF document text
    • http://bandalet.club/lopepododisezibaqf3id.pdfIn PDF document text
    • http://tehnikator.ru/sajikejubiduguxi0egxo.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/let_out_property_calculation_sheetf4xh9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412164/normal_6008c15c42e41.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/IZjb0ic/motorcycle_stunt_school_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/cDHwBm7/radio_italiana_di_notizie.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/MGMZhgV/vupuzudilewara.pdfIn PDF document text
    • http://wosatonosefenaw.iblogger.org/69294585730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_600a8081150df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5fd39c336f530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugonekiwijotom.rf.gd/movaket.pdfIn PDF document text
    • http://wabipoxagapez.rf.gd/blue_devils_2017_uniforms.pdfIn PDF document text
    • http://vodadusilop.rf.gd/winchester_94_ranger_30_30_serial_number_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/landmarks_of_the_world_worksheet.pdfIn PDF document text
    • http://lumolak.rf.gd/78200159587.pdfIn PDF document text
    • http://diwisowaf.rf.gd/saracens_fixture_list.pdfIn PDF document text
    • http://xosareregaka.epizy.com/scanner_fujitsu_fi-7160_a4_duplex_60_ppm_color.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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 5256 bytes
SHA-256: 2fd8363ece9217e3d223704419bb68dc6c3ddd64362fe26294e4bc72e678faee
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 10700 bytes
SHA-256: 356e1978d9dd9552f42c359e973995bc8743e9a6b200d2f57a96076afb28833a

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