Malicious PDF — malware analysis report

Static analysis result for SHA-256 582ff9a8fffc322c…

MALICIOUS

PDF

97.3 KB Created: 2021-01-14 09:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0f596180f5187016d4e9485aea583a75 SHA-1: 4e8290603cdd1ad6c31b84d31df4bbcdde2d2050 SHA-256: 582ff9a8fffc322c2b6936b36845984b83c8dab3a9ce8c338e31b98ba47abf86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/123?utm_term=el+solitario+horacio+quiroga+preguntas+y+respuestas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5f96d2080ece7.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/bhgbYeG/8438587145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe50efa3b393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ffd9e6080b7c.pdfIn PDF document text
    • https://site-1174761.mozfiles.com/files/1174761/jiniwumidegifabuzipuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5fdaf3418655a.pdfIn PDF document text
    • https://site-1171754.mozfiles.com/files/1171754/magazine_template_free_word.pdfIn PDF document text
    • https://site-1168038.mozfiles.com/files/1168038/acrylic_nails_ideas_coffin_blue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fe103b1232ae.pdfIn PDF document text
    • https://site-1174676.mozfiles.com/files/1174676/verizon_cloud_text_message_restore.pdfIn PDF document text
    • https://site-1236009.mozfiles.com/files/1236009/wexegenipuladazisoxibe.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/haxhKgj/navneet_books_for_12th.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_5fdb2892beb72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 5380 bytes
SHA-256: 5798f7ba79ea048c15a02c502cc9725741053611fe555bd7322d2661996173f9
font_01_sfnt_off00015078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15078 11508 bytes
SHA-256: 4a8e6529881377d67cc6be4bd4efac45ce4540fb1bc3213323bfff041fff8925

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