Malicious PDF — malware analysis report

Static analysis result for SHA-256 766dcb803e982edc…

MALICIOUS

PDF

75.0 KB Created: 2020-12-18 16:33:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9620999fad645690354be34361e0ee52 SHA-1: d9ebde08a5a1eebfa61984563dd6ad19a668d3f3 SHA-256: 766dcb803e982edc16499cb4222f5b54d99d1ab77f6cefb272d0c04a46138a79
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO link farms or to direct users to malicious websites. The primary malicious URL identified, 'https://trafffe.ru/strik?utm_term=lane+tech+college+and+career+center+jobs', suggests a phishing lure related to job opportunities. While no scripts were explicitly extracted, the PDF structure and numerous external links, combined with ML and ClamAV detections, strongly indicate a malicious intent to redirect users to potentially harmful content.

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://trafffe.ru/strik?utm_term=lane+tech+college+and+career+center+jobs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423453/normal_5f96e1bb316b2.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/tirutegebotafexomuzo.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/1466233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fd13b84bdbd6.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/labamaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc3799d60f2895dc1f82192/t/5fca09c72f5dbb44b781fee1/1607076300250/74528232616.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/sports_and_free_time_activities_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/android_games_with_xbox_360_controller_support.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/z390_aorus_master_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/15979372417.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/customs_declaration_form_philippines_2017.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdca98d9e7d8d17cbb96cee/t/5fdcb2c46b8b5f6dc2816c9c/1608299204871/bagepofenajitam.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5360 bytes
SHA-256: 1e16276ea80ae501fadc7500856bcc8a1d5ba253aef39171b99df044c6ed4edb
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 11076 bytes
SHA-256: 1bf9e4d77c9dc4ec3b99b41f360ad48cf84138cb901acedfdb912b0856c30347

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