Malicious PDF — malware analysis report

Static analysis result for SHA-256 6537f33e91e22698…

MALICIOUS

PDF

79.4 KB Created: 2021-03-24 19:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23b9363dd3ef4f9a336ffacfe34e9e96 SHA-1: 93b99e1a096111934ced9fd5ad6bd0c21fc3804c SHA-256: 6537f33e91e226984891f3d2d17ef0cbaa76a324e625def68056805670290988
126 Risk Score

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://xezojetit.ru/wix?keyword=voice+ringtones+2017 PDF link annotation
    • https://cdn.sqhk.co/werutojij/iwggida/68847064284.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/g58WXWm/25187081194.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/ce91d6.pdfIn PDF document text
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/5963706.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/DpEhcii/free_digital_marketing_strategy_template_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60179c2ba8976.pdfIn PDF document text
    • https://cdn.sqhk.co/rufonova/dijez9z/68556658562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_600aa694be281.pdfIn PDF document text
    • http://diweluxof.22web.org/44700866356.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/kodedubexo_gixuji_damejoletim.pdfIn PDF document text
    • https://kavosoxevab.weebly.com/uploads/1/3/0/8/130874108/fewulexixefawiwajur.pdfIn PDF document text
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/15c1181ac844155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5ffd20d03d2ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd25810adab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://selaxarizipa.rf.gd/797556507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8d89a5-ec36-46c3-805d-ca98b0386d5c/jadifiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3392398f-9f05-4430-a2f9-86cd5d3107f3/how_to_use_vivint_smart_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b951391-595c-484c-b68f-15779d91326d/16896729424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4bbb58-5130-4fb1-8de6-1e6c8bc61354/53106300272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c924abd-7e1c-4052-b156-355600e567c6/pentax_k30_camera_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c3bc0d-68d8-4198-b2f8-0c567857316d/58013043607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9eea2b-7b35-42fa-8510-dfba9e415ef4/redananidiwik.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 4884 bytes
SHA-256: 16b22d64f2dbad625faf5087ce04cbcd8c292c65bcea11fc2110995bfa43f8a2
font_01_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 12228 bytes
SHA-256: c9a9503dbf51ebe6da11666838ead0678c94b4b8c3691bd06af1ba80fed67200
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16544 bytes
SHA-256: 8d45f5f417e74c11d54eaee7138901bb4b2498e40dea16ccf89f2c2707c13e35
font_03_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71