Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b920950100cffda…

MALICIOUS

PDF

83.1 KB Created: 2021-01-01 20:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a1cd8cfbe594547fd7e095e55b7423e5 SHA-1: 70ba606b567e8330fb7eaa71d5ab5acaf5dd3061 SHA-256: 8b920950100cffda4fda8a28218f8936d9e16ac9988e3dec8e54e03a55f92e28
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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=biggest+box+office+movies+2017 In PDF document text
    • https://cdn.sqhk.co/xidujefonari/f1Nm9je/bedwars_map_minecraft_1._12._2.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/daseneziwi_davolima.pdfIn PDF document text
    • https://fidexodopisulo.weebly.com/uploads/1/3/4/8/134861067/xekimulir.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/TT4ibhc/easy_chocolate_icing_without_butter.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/37abf109e46.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/kabisebax/homer_jr_high.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/caracteristicas_fisicas_y_psicologicas_del_adulto.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/69214528227.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/newukonirav.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/lalipunute.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_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 5588 bytes
SHA-256: adf03556a53c228b46bece11d5243389feb1d3bd82f8ab02d6167ba392fae7e0
font_01_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 11336 bytes
SHA-256: da775381503f451591515b08bc7c22f3030bd0c44ad7d7d079bbd79e98c4845f

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