Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffa3ca7575962e9…

MALICIOUS

PDF

74.4 KB Created: 2020-11-24 17:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac03c1a840540c789c20bf207f859ae8 SHA-1: 9df7ca4e4c2c2c55390453fd3bf44b94196334b5 SHA-256: 0ffa3ca7575962e9cbf9f80c1b23269009ccc1b3c97173a42d90cea66dc2f6f1
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 0.9997

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 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://traffset.ru/strik?utm_term=giant+food+stores+employee+handbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5fa49d42460fe.pdfIn PDF document text
    • https://madapupe.weebly.com/uploads/1/3/4/6/134667506/womuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fb69d160c3ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fb0377384888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8748d06fa63.pdfIn PDF document text
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/gexovotix-tafekibiperiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5f999f9d90ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_5fb5c3f13674b.pdfIn PDF document text
    • https://nugatifijomit.weebly.com/uploads/1/3/4/7/134715362/c705b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8bfa29164a4.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/kabasekudagosemezama.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://s3.amazonaws.com/jefobexapulow/kindergarten_worksheets_learning_to_read.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/aol_news_mail_video_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/can_t_hurt_me_portugues.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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 5408 bytes
SHA-256: bd69f4c0bffd6e55aa97f9fadceb48c3edbd744b81eab31660d6d2ac68e271df
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 9764 bytes
SHA-256: cc6162b4de5f33ad83a82d7b56f855092e7d0ddf0f8d0a5f5b48f2096073a2cb
font_02_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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