Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b32330eda60e43…

MALICIOUS

PDF

75.8 KB Created: 2021-06-07 01:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b148c32fed6f57b43b13d3e25afc4c38 SHA-1: aea35a7e1557dc7a320526e96012f43d4a9aa329 SHA-256: f2b32330eda60e4399dc86dd703b36c38bff05e86bba3af1f6e57d5bd6014d79
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/123?utm_term=bajrangbali+film+video+song
    • https://cdn-cms.f-static.net/uploads/4470542/normal_5fd8b5fa32cf0.pdf
    • https://static.s123-cdn-static-d.com/uploads/4425737/normal_60b208f9b494e.pdf
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5ff7c671588bd.pdf
    • https://static.s123-cdn-static.com/uploads/4450501/normal_5ffaedfeaef49.pdf
    • https://cdn-cms.f-static.net/uploads/4421354/normal_60bcafd4e6940.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_60624ae399da1.pdf
    • https://jefudorovuges.weebly.com/uploads/1/3/4/7/134706397/vagadabesagarofeveri.pdf
    • https://cdn-cms.f-static.net/uploads/4383334/normal_60390bac785fe.pdf
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fe9d221425ac.pdf
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fe9d73f311e5.pdf
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/rijexuxur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35ea8743-2561-43be-82b4-322a7cc1a7fb/50121242830.pdf
    • https://uploads.strikinglycdn.com/files/dcf7c614-7004-4402-98da-54b1dcfa6590/10189831471.pdf
    • https://uploads.strikinglycdn.com/files/7792202b-b836-4be4-96aa-aaf31d455a10/76702566288.pdf
    • https://uploads.strikinglycdn.com/files/56119380-2de4-4fdc-b1cf-5c92349e5828/carrier_weathermaker_8000_inducer_motor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea37.bin
06eb056133408244e777827425dfbbbc063e01fae1e072f76963b3688b52d3c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 5552 bytes
font_01_sfnt_off0000fd13.bin
2b4531674045aecc3d6e6b06e5934e780e1f7057df14d9e381f0f894fe75512b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 11120 bytes