Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e51183c5a2eaa7…

MALICIOUS

PDF

85.5 KB Created: 2021-03-14 21:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aa9e48f0d39de0399a03bc026570a198 SHA-1: b7eec6a39f82f57f5d23c38321154ba78ed5a64c SHA-256: 69e51183c5a2eaa7a3a1f4c4d7759ae87aab25f78a94746f9c4a83fac41b9a4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL containing a keyword related to educational content, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://ponafet.ru/wix?keyword=variable+separable+differential+equations+worksheet PDF link annotation
    • http://imedo.ru/tai_chi_teacher_training_near_mezl2dj.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/8DcghiR/single_packaged_vertical_heat_pump.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5ffcc006ebfcc.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/8428672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_5fd84f05affce.pdfIn PDF document text
    • http://ighelpcenter.xyz/90980958809nt2oe.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/D6iff06/chardon_municipal_court_forms.pdfIn PDF document text
    • http://003-center.ru/10878786918i06x0.pdfIn PDF document text
    • http://decideyouself.fun/welikudavawoguvonujizy09a4.pdfIn PDF document text
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/d0b10aecc78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_6048ef8ddaf59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_5fd9acf557511.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/vufupu/63663682597.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/52003496055.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/50549566296.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/boxers_and_saints.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_b82361de14584f398ede1e513033bb81.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_42a61b5d6b1540418687cae6b5737402.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_3a8263cd9a5a4391aab86abe069b29a7.pdf?index=trueIn 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_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 5516 bytes
SHA-256: f2460b0c3af2c8c587e66522dcc74ef3fd758d9df14fdc240d0284569646e246
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 11712 bytes
SHA-256: c633566c5d6d825a26ae60dc0c0325f4a148bb32e8612d7ce3eef7c6908d25a1

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