Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec514fbf9383a82…

MALICIOUS

PDF

77.6 KB Created: 2021-05-13 23:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e20eb9e3bb28b13f4b9ac50b24924114 SHA-1: e6c7bc65506db9076693bb2de1fee3282d51fbab SHA-256: eec514fbf9383a82cbea9fdf3d49831ae11865844bde7fd9af9469d83e02e1c0
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially obfuscated, suggests a lure related to a job description, aligning with phishing tactics.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=second+grade+teacher+job+description+resume In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_60335fea8807f.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/vubuvakenevajugavawoz.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/purej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_5fc7f410f411c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ff602ba268a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_5fdc328610d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_601b7aecd7913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fe41d59df056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_60132a84e5355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_60304ec22f94e.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/xijuxosisomuna/potesa.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/auto_root_tool_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/functional_movement_screen_corrective_exercises.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/importance_of_archaeology.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_6b2bc442ab5b4684ab34e91b672ab6bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/dajuzazijoparemagelixi.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/biforofosagafob.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/os_x_catalina_slow.pdfIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_e5ba4f2772254e58883fe2bfa72765fb.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_b1dc508f12344f489eaa2a079acedcb7.pdf?index=trueIn PDF document text
    • http://sukokovevaz.atwebpages.com/holt_biology_online_textbook.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_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 5772 bytes
SHA-256: 842881aa25bd9e7363d88ee9de6a2e765bc98f9a9d08d044ef680a0baf11d2f7
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10960 bytes
SHA-256: 9e160881209b122859fd02af1f3f25a5c82bca7c46f1cda313974b82ade0f329

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