Malicious PDF — malware analysis report

Static analysis result for SHA-256 335f8e48cb0d1255…

MALICIOUS

PDF

65.0 KB Created: 2020-11-09 23:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c03fe56c19f48b491551cb02716f49a SHA-1: 95a382314a55dfb907495138de046c980944b7d8 SHA-256: 335f8e48cb0d1255243124273e068da8be53e7ef0d93dca3ffdecc110aa0969f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/123?keyword=chilton+labor+guide+book PDF link annotation
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/xizoxewatidode-zakekakodasizap-wonosun-zolipozesi.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/8728981.pdfIn PDF document text
    • https://jinoxunetoxufa.weebly.com/uploads/1/3/4/6/134698665/rinolinal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f944f7d0aa96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f8b61c9a7a84.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/16509fe34e3b.pdfIn PDF document text
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/769205372.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
    • https://uploads.strikinglycdn.com/files/2900167d-7701-4e85-b166-40489e8cb191/bmw_r1100rt_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/the_fix_cancelled.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/encase_forensic_training_download.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/minecraft_pocket_edition_apk_1.14.1.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/pesomaledevajajosa.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/kazemun.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/tuzuguxumalizu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 5016 bytes
SHA-256: 212d0476aae2cf82aae90697f01bf3fb360bd6c7050820abb85a55d88731f834
font_01_sfnt_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 10036 bytes
SHA-256: 657be3f32c27d16cb8a9dabd53e02c7b08fbd9f01b66e12c210570988fee5374
font_02_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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