Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d54212765c817c…

MALICIOUS

PDF

73.6 KB Created: 2021-03-03 21:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00817b0911ce3629662bd9aa006172da SHA-1: bf1121ac8e5a34991117777c408d1958d78fd8e2 SHA-256: 53d54212765c817cd051173618aeb01331dd85295097d30998eb67c887fc3a86
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated in a link farm pattern, suggesting a malicious intent to drive traffic to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

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://zajinet.ru/wb?keyword=the%20walking%20dead%20volume%2029 PDF link annotation
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/lapimuxinatupa_puruwisigoki_rotiginuma_begetivowade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5ffed2225a6a3.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/7649914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_603ec8a9b5c7a.pdfIn PDF document text
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/1726621.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/xebujexogoj-zixelis-povipumakajif.pdfIn PDF document text
    • http://topstudy.fun/detailed_lesson_plan_in_english_grammar4inrp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojegasofibi.epizy.com/department_of_correctional_services_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/103j_capacitor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/boots_manual_breast_pump_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/is_true_polymorph_permanent.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/61630901351.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5416 bytes
SHA-256: bccd60b03ddfccad61504e167acc8dd2f3eb833cdaf1ad63ecb260edb054b1da
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 10360 bytes
SHA-256: 429a966b5626670c7ebf72d7bffb70be1d94f933e669a287938000d18648bbb8

Open this report in the interactive analyzer, or submit your own file for analysis.