Malicious PDF — malware analysis report

Static analysis result for SHA-256 552cf14aa01c2be5…

MALICIOUS

PDF

72.0 KB Created: 2021-02-23 00:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1bd2eea837e90854904f805d7f75beda SHA-1: ba95c7c221698e676cee9b6e12acdb948d4f6a8e SHA-256: 552cf14aa01c2be5c7cea96ca290ac4040e02ef1be2d43807bb26dc8f7ff83ce
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 pointing to other PDF files hosted on various domains, indicative of a link farm or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly flagged it as malicious. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious or unwanted content, aligning with phishing or malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=georgia+driver%2527s+license+name+format PDF link annotation
    • https://cdn.sqhk.co/dezorevukor/tHiehge/best_sniper_movie_series.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/3500162.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/geichhN/drag_bike_racing_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fca62ff6ae82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_600c6dffa64fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_5fdc7d7dbe895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_5fd7771891db5.pdfIn PDF document text
    • http://reduslimitalia.website/60902666617y5i38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5fd7f8b0494e0.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/e8c30c5.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/rozebofukixus/98694297772.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/how_to_write_joining_report_on_promotion.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 5464 bytes
SHA-256: 43d905ada026c0973d2ff4e764ca7b845a0c358d8149cd5c56a99a42e4b40fdc
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 11772 bytes
SHA-256: 6dfd27bee0c3d9fe7bcac016df56a999876616f2488a5e2f585ed43d526b6051

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