Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc537f3235a5e96…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 09:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 907b6e50e13fa4a558a6d81d0a3dcb84 SHA-1: bcf241035de56de637a5fc7d7645529670947967 SHA-256: abc537f3235a5e9615c7d926b97ab63c51ac081baba0c37195c7cb88d7c6b63d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection profile strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=shadowrun+5e+metatypes PDF link annotation
    • https://cdn.sqhk.co/fexilejedit/SQgghTD/qdialog_modeless_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ff515fa7f301.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/jbnhd2I/shape_slicer_3d_turn_limit_level_87.pdfIn PDF document text
    • http://edayafar.xyz/zanivijovafawi5s9sh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_603345d446a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_60513936158ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_6027e58a43d11.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/GefpThe/soruzedugubuvojujesamom.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/jszgjje/buyout_offer_meaning.pdfIn PDF document text
    • http://apkweb.net/what_could_be_causing_my_blood_pressure_to_be_high7slzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5ff75713c0679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_604f015247922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504870/normal_5ff9ce6f2c05b.pdfIn PDF document text
    • https://cdn.sqhk.co/tipapija/ohepgdL/52407209798.pdfIn PDF document text
    • http://normaa-id.com/what_are_the_chemical_properties_of_oilo94bi.pdfIn PDF document text
    • http://yourcy.com/the_greatest_salesman_in_the_world_moview8u4y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5ff575d33d023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_602929ac0b821.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a54c907-d8cf-4632-90d2-c8e8b46fc2ce/the_gnostic_gospels_of_thomas.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/android_vs_apple_privacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ddc092-b0c0-4278-b5ff-5104e96cc083/31945952633.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/lagalozarawisug.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/spring_roll_sheets.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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 5588 bytes
SHA-256: e3cfef73ce8e4c7da6db98da69ded8c2161b03e21b1227bcb42f8355b862e85e
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 11400 bytes
SHA-256: 0838b05864c7d1cc09fd11def1fc334198b0d77192936677c6287f161dd5f2ce

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