Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a94b4585cedead…

MALICIOUS

PDF

68.5 KB Created: 2021-02-13 11:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 99666a637a81336c04a2910c72e917c6 SHA-1: d053ef6a62aa3086479907cc16d5512b293a4b41 SHA-256: 24a94b4585cedead210403f52d3eea5b586a07e96261074eb572d03ec65167b5
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 point to PDF files hosted on various web services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=basic+processes+of+science PDF link annotation
    • http://volazanuva.22web.org/6853541904.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/2733496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_602628dcde17d.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/4528069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5ff82295561d8.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/gd3Rhab/14702531603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5fcd693ad23cf.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jbbhbjf/alien_shooter_2d_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/hgjaibZ/call_my_metro_to_pay_bill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_60137d2d6cd7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ffb60e1e7ae8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_600143c123a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_601100b28bad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5ffcf154e250e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc77502dab7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_6019b276df3e4.pdfIn PDF document text
    • http://diniwesavaku.iblogger.org/microsoft_excel_viewer_2013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 5028 bytes
SHA-256: 04875e4e09b3c9ac394f8f31f10ab81dce3756ffa0af33996e111f12a33ad960
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10020 bytes
SHA-256: 004b24289ab76006a74dd1144ce94279a084683fdcdcad726026b0acc22b62c3

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