Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b55ef82a3626a48…

MALICIOUS

PDF

75.0 KB Created: 2021-06-08 05:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0c4be002529d64b0b102ec188b738d3f SHA-1: a9feba4118038b50408bd86368e5fc3b702f10c3 SHA-256: 0b55ef82a3626a486442e59247956cf7ea422c6685226edf428f4c9a617514a0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute malicious content. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a deliberate attempt to direct users to potentially harmful external resources.

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://xezojetit.ru/123?utm_term=ffxiv+weaver+power+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368759/normal_6046f701865e1.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/xuvuvaxeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_605aa37cf185e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422912/normal_600327e1cd9ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383446/normal_5fc89e122ff13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fddbf3161c93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_601e05e6f24e0.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/topobirol-sinasodevivapax-wirilowevuboga-suvigigujexate.pdfIn PDF document text
    • https://zejafopo.weebly.com/uploads/1/3/4/5/134505046/1244852.pdfIn PDF document text
    • https://relotozaku.weebly.com/uploads/1/3/4/2/134266658/7690232.pdfIn PDF document text
    • https://fejavuwuvumago.weebly.com/uploads/1/3/0/8/130874007/manalukudifozu_zogaduvepig_xufobivadobo_bemirijejepemeb.pdfIn PDF document text
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/ba30111bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ffb43759c656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ff3f028d0aa8.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/xirusunuju-gakijabuxo.pdfIn PDF document text
    • https://jofovavugelizud.weebly.com/uploads/1/3/4/8/134855980/02589a1fdb79f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jijagenaneke.pbworks.com/f/38713881050.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/68862276022.pdfIn PDF document text
    • http://numefen.pbworks.com/f/virginia_real_id_appointment.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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5208 bytes
SHA-256: bdcb8d6a61b6cf3bbfc2271f263362b8cb79cb0aea31010c2d568ea91a7fd1da
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 9656 bytes
SHA-256: 9ffdc9bb00d61e7bc7ef107462ebb4678164c12dc15c4d56288cb95215c576e9

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