Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace37db0ce9db0cf…

MALICIOUS

PDF

73.0 KB Created: 2021-05-11 23:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05d286da71d6bab740fca820e10d26bd SHA-1: b0a63c5f72cf76b2f192c58e3b0a62acede7d753 SHA-256: ace37db0ce9db0cfd940ccb85a5036c417ba906047c58586fc352dc10b2a89e0
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 0.9996

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://vilenefex.ru/strik?utm_term=the+yoga+anatomy+coloring+book+pose+by+pose PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483589/normal_5fe9c637d682a.pdfIn PDF document text
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/285436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_6048dd188e2ef.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/ohi5Jia/jugemujigitevumawavogaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/h8kQhgv/uae_exchange_rate_gulf_news.pdfIn PDF document text
    • https://romubavopu.weebly.com/uploads/1/3/4/8/134884942/kokebakone-kebofijeretugof-soneminikavasol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_6048ddf01d49e.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/iajivbJ/vuxufigomupela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_605b6bb182bda.pdfIn PDF document text
    • http://perebobusagu.22web.org/31953831587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_602464e488b9e.pdfIn PDF document text
    • http://jabolemifagafu.22web.org/canon_7d_mark_ii_specifications.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/4893263.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/hhdhejf/69927866639.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca6b7a9-72d5-456a-8c15-37b12a7f5d45/asus_rt_ac66u_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4378e35d-4ee9-4273-8cd3-c02de4e9c2cd/flowers_for_algernon_movie_comparison_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/sugesadexasaguredulejide.pdfIn PDF document text
    • http://zugemanuzori.rf.gd/learning_needs_analysis_and_evaluation.pdfIn PDF document text
    • http://kigiviga.rf.gd/72601718255.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/acer_aspire_7741_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d577400-fe2e-41cc-be26-7a628c5f8f70/kipawud.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 5604 bytes
SHA-256: e65ac1e5f7abc9f38978589422c041967a2f8c0d1ff4374ec41a14dacf064c4c
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 12748 bytes
SHA-256: 2a57e670418d5dd189f2ba5437f733382f6152deae63f5ddfdaa520b5d6e066b

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