Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c62a5e876db346a…

MALICIOUS

PDF

65.7 KB Created: 2020-11-18 12:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5dcc259272f556265896344cbdc144fe SHA-1: 48492242a995ce170dff741266c0f8cea88d4824 SHA-256: 0c62a5e876db346ab7adc117b15f4f0cf5109341b9079dc8354672e752f2d396
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous links to external PDFs. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=illustrated+english+spelling+dictionary+pdf'. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?utm_term=illustrated+english+spelling+dictionary+pdf In PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/jivudugog.pdfIn PDF document text
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/fijewiwokokes.pdfIn PDF document text
    • https://gamorajemusuro.weebly.com/uploads/1/3/4/3/134316050/e424a0.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/713485.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/nofekomisufabukuxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f94d8a6c3187.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/xelikedaresobow_tibuzegutujub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/67727799042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b73dea-730e-4918-8ce4-22cf4393229e/divx_software_dolby_audio_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0d6d11-9c92-4d2b-ac0f-1ae562bb8af0/goolsbee_levitt_and_syverson_microeconomics.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_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 5456 bytes
SHA-256: 27d0d1816356620d6fc2369e61998b7c932bc58a9253c61fa47b98029ead4eef
font_01_sfnt_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 12204 bytes
SHA-256: a389e6e8b0204d942f2542fa0b975255bfc155ec6ffd0e1c689acf0823a29529

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