Malicious PDF — malware analysis report

Static analysis result for SHA-256 8336507b91f86e07…

MALICIOUS

PDF

86.4 KB Created: 2021-04-30 14:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2135d4a3f074a0ef564b908b3779d525 SHA-1: 1f2822811a40a56532ac2560393558484a5ac419 SHA-256: 8336507b91f86e07d1da2bb0f51f8181b1fa0f2b170e95e629e4dabc24a3cdcf
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 0.9997

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 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://druttle.ru/strik?utm_term=star+wars+knights+of+the+old+republic+pc+download+free+full+game PDF link annotation
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/d02b7bac1f4666a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6047828cdb3be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_60240d77b3707.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/5218365.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/bf8387ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_600c7b98e8e7c.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/XibGYUh/togijerereniz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470698/normal_5fe19f76eb93b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5fe233678f2fa.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/jnNgche/love_stories_books_read_online.pdfIn PDF document text
    • http://bestgirl69.com/domains_of_dreadc9tsx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6046698254a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_603260b9b1178.pdfIn PDF document text
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/6804d3.pdfIn PDF document text
    • http://cocobuka3.xyz/cymatics_video_free49t2l.pdfIn PDF document text
    • http://naturfresh.space/dead_space_infector_death8z1cs.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/3bb63f7.pdfIn PDF document text
    • http://uptodate.site/libro_amar_o_depender_resumen8i23o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujuramu.rf.gd/interlink_electronics_fsr_integration_guide.pdfIn PDF document text
    • http://wobudesupak.epizy.com/ganesh_aarti_songs_telugu.pdfIn PDF document text
    • http://vininotubosom.epizy.com/manejo_del_cultivo_de_arveja.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_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 5968 bytes
SHA-256: 770045cc2c5d4c467edfbb0cf8f2710472a38c9a04642fcda91ffc6372d08c86
font_01_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 10744 bytes
SHA-256: 4af0d74083dd9351f312c13f4b9cdb7dda8ebd07847d8c91d8283d22b7d51d21

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