Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f1eb7dd6c2e6cd…

MALICIOUS

PDF

72.1 KB Created: 2020-11-25 12:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9f0dcda747c6f12a62a27757cfe185a SHA-1: 1489fd59787e6ab36fbb208b54f5c4b26c8dfd07 SHA-256: 38f1eb7dd6c2e6cd817f9b62a9c0518d0437e36c6ba761792d8f4d0c3d061d27
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/aws?utm_term=callus+formation+define PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444852/normal_5fbcfef0c3d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f99967bea3ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_5f9e16ec6e401.pdfIn PDF document text
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/1298964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f942be8ea0be.pdfIn PDF document text
    • https://sekoxakukajafal.weebly.com/uploads/1/3/4/7/134705290/5196628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fae25c0140f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fa581d73802a.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/feaa40bd-3da8-4465-8475-83d4257505d9/vurubiroxukomoku.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/74022550814.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/murita.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/cartoon_network_tamil_shows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6610f8-18ee-4b36-8fcf-79bd0aaa3f00/1382877213.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/87017508777.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/jenodipufevumetisin.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/rizudaruga.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_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 4960 bytes
SHA-256: 8d88102cb8fc513236449239bd3c054ccbf4e9b5064a7c180215020d3ef6b70d
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 12000 bytes
SHA-256: 31ab76c33239b52d9555c76d1b84ce6ddb101a0b658409faaa9c3781e1a62e89
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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