Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca5fcc2d4cf6dfe…

MALICIOUS

PDF

71.3 KB Created: 2020-11-24 17:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9eb3c25d8c78c548a16bf8cc093685d8 SHA-1: bf542ff2a9ed9af46bb604e3dcb0a601c6ddb32c SHA-256: 2ca5fcc2d4cf6dfe342a3341cac978480461f6d3d3858a258a65c757150de2ac
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 one prominent URL pointing to 'traffking.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are numeric slugs, further supporting a malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. Although no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=welcome+to+our+wedding+sign PDF link annotation
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/watovojagado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5fa55b4df34d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f8cfd42b0d56.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/rizezobabub/53330883397.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/bejeweled_classic_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/yellow_branch_elementary_school_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/35782061375.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/87051070059.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/pandigital_scanner_kodak.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/69132914121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffacd24-43d2-4bef-82ba-9536520236b6/foratibatalawujukidukune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b831718d-91ca-4a1a-a6cf-46a4820d3849/66227904789.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/thesis_statement_and_informal_outline_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/2019_2020_school_spelling_bee_study_list_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba79c520-1771-4480-8b69-537d607cd446/biografias_de_los_hermanos_flores_magon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d7f050-4367-4951-9f39-fe066655c398/12031178721.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_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 5036 bytes
SHA-256: 734722a332eb92429c572804b98df51e4fc3c6a6dc8b08b11ab0e6ab1fc7693b
font_01_sfnt_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 11344 bytes
SHA-256: 6152d4290599dbc0924b27c1a67a7a2e093c59cd9e7b12222134d7f4b36ab305
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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