Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1c0185d613aee5…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 12:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9f7e97ead37c7f0e44d90d066a497189 SHA-1: b1554395c66bf1bd39efa2cb143bdf33c6c81446 SHA-256: 5e1c0185d613aee549a789696be7ec2dcb68e0891b9c8781e7a43a5a1dd18742
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=administrative+law+pdf+open+university PDF link annotation
    • http://lakenamazaga.iblogger.org/beef_o_brady_s_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_6049b35b4b880.pdfIn PDF document text
    • http://ekzo-fruit.ru/zinowumhmu2q.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/agronomy_crop_production_download2xaqk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_60062c9fa3830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebozobab.epizy.com/nanostation_m2_setup.pdfIn PDF document text
    • http://ludumidajite.rf.gd/koxesokaxero.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_b4349d4a5f8a44feafdf1e9fbed11732.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2354b0e1-24b0-42cb-8477-0d8d0d0a019b/telsta_a28d_manual.pdfIn PDF document text
    • http://xoxopeso.rf.gd/resumen_libro_2_juego_de_tronos.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_0c0409dd2662440cb7dbd9dd54ff54aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/901c5465-ab62-423a-8ad4-3c43be3092e1/garou_one_punch_man_wallpaper_iphone.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_76276320e8d1404294049d6467355072.pdf?index=trueIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_3195d452e46f49b49b9d01c6b83ad97b.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_d48d6b94e320448293c91880b5c0885e.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_539c41f46d9c4931a86f9b269f66f6a4.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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 5428 bytes
SHA-256: d45c73c952253ddf2eda467dfaf2fdf82e93b0640cb2f6e66f7fe6209afc3c08
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 11176 bytes
SHA-256: 7b919bb3651812e6082c1dcac37b354cfa573a207878ccf2cc304fc8108910c1

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