Malicious PDF — malware analysis report

Static analysis result for SHA-256 1420808fea4df0d4…

MALICIOUS

PDF

62.7 KB Created: 2020-12-23 08:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 37ad695b452553219e7f93804e1e8f56 SHA-1: efb9c69c420cd608e3d742910b36241a25ddaaf2 SHA-256: 1420808fea4df0d49784c0a86973be7d571c6dcc3faef6c0d203e56120ed3aa0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://trafficel.ru/strik?utm_term=marketing+jobs+denver+tech+center', appears to be a lure for job seekers, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

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://trafficel.ru/strik?utm_term=marketing+jobs+denver+tech+center PDF link annotation
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/4150836.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/175af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f31889b-2ff4-42e7-b226-40fbc6943696/bible_tabernacle_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2520754b-c6ef-43a9-ab77-0c682e1327ad/58683625902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fa7e68-39fe-4c12-82bf-596e366f5ecc/systems_analysis_and_design_11th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f02f01-26fd-4329-aaa2-d9d1d8724ee3/dexawer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd3afea72eb64407c975fe/1606236927264/55225053838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e209b6-c1ad-4b03-9b43-70b9ef1996c5/difavukudizevosamumirav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ca14e8-3e30-4cd6-99d6-aadb515ebfe1/13793109595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9374f0a-bbe0-407a-b124-c48ca70e1e60/68673274454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95c85ea-0cd5-4e9b-bcbf-337ef46891c9/rimuwukanevetejovim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05b0c30-d286-4501-ba00-dd70d3d05f75/power_bi_resume_templates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed012e537a05ef0936a0/t/5fc903a23435706273bb9957/1607009187016/nudaretefadikoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b073b95-357a-407d-bfca-2703b50c9301/cisco_official_cert_guide_200-301.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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 5512 bytes
SHA-256: 88dd54ccab1bb841cd295e5a73157040b60ed5329223d85517415b9c66620732
font_01_sfnt_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 11320 bytes
SHA-256: d1904425a692cc6de008550a76f348ad5ef68728851290398795976fde663942

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