Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd10b8bf2cb4ff8d…

MALICIOUS

PDF

80.0 KB Created: 2021-02-18 05:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: efde6ff62edf2bed44711d862b0a603a SHA-1: 2e2e7da2051bcba7fb19b7498a3240a44457918d SHA-256: cd10b8bf2cb4ff8d84f2f9fe5f7fdd9456d54835a14b28c51d548b62e9f1e85d
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 PDF files hosted on various domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=ge+spacemaker+xl1800+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/kulobibab/1jehijf/95396988887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_6005597040520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_5fdfaf573c9ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451027/normal_5fcabfdf68a57.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/81bfb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fcf629e94ca3.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/towewipukovewonux.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/sjaiamX/72120140943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fdec00620e99.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hjasjfr/archero_runes_talent.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5ff264853861b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5febc1a14c5a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5496 bytes
SHA-256: bbc15b2837359aaea53633b100ceb0d0d1422a9d3ec473f1bc5235fb00b556a4
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 11228 bytes
SHA-256: 7f484d8c796c626a6ec22418a1324591e5aaf5e4d269cb6a4205c2d5a7ba52d5
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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