Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2074214916d7c6c…

MALICIOUS

PDF

65.1 KB Created: 2020-11-10 01:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b5320cd72425ee8aadb01da4e4c1a2ba SHA-1: 2e2ee9202aeed1f23f972d2e4e6fce8800be8291 SHA-256: a2074214916d7c6c606cfc1e1da19a0cfb5fbdce3d28b8b5d84c0954811e3c58
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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?keyword=cms+athletic+zone+ticket+to+play PDF link annotation
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/786202.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/8962871.pdfIn PDF document text
    • https://sijanobodebalu.weebly.com/uploads/1/3/4/6/134639398/3bfdd.pdfIn PDF document text
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/vusugoxureweg.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/6dbb13c.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/gaxukegudo-jexipageburujof.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/2161657.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/84abc5d9-044d-4627-b8d5-b29676882e07/gawifebilivab.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/65219209893.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/draenei_paladin_is_very_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3b251c-e5d5-48aa-8855-e72421b00118/xegugalesogaruvigejewip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57127cca-36fd-4098-9b2c-5c2fdce851a9/saveki.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/free_minecraft_codes_ps4.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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 5196 bytes
SHA-256: 397ef9e02ff0655568f99667f5e3c09a35e4fe307bab067dc0d6f59fbab1dc9f
font_01_sfnt_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 10564 bytes
SHA-256: 8d2a1163514898fd9337dac0a50f24b0e5c589f281fd8f8cdfe8fd4222ab4c7c

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