Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa856e58922400c…

MALICIOUS

PDF

86.8 KB Created: 2021-03-22 21:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 916e6f6188bdc9095377198bae55e6b7 SHA-1: c9f5b09f978bff721d9a9b9a2c0629d9b0d47299 SHA-256: caa856e58922400cc9990f97824385b6f326fc0deb9deb60e4dff722ada3a9f1
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://lozipotod.ru/award?keyword=cefuroxime+drug+study+pdf PDF link annotation
    • https://wixotofipexux.weebly.com/uploads/1/3/5/4/135400714/jalegogatoko.pdfIn PDF document text
    • http://study-english-04.space/us_history_trivia_questionkoklf.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/5482179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_6017ad3c9b13d.pdfIn PDF document text
    • https://vifixizunegivu.weebly.com/uploads/1/3/4/3/134349865/3255375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_600f7bdb7939b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6056dde95e4e9.pdfIn PDF document text
    • http://chatik85939775.fun/canon_mf4450_scanner_toolbox719f7.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/vakipote.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/welanisowari/fosubuxuduwurog.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_afe4a69d943545e0b4e7285875ae10d8.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_0fc80700bf8c4b83964a7bfb35cea065.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/how_to_do_finger_joints_in_wood.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/65171678105.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/sulitivegalagonedavabik.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/barber_shop_logo_design_template_vector.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_893662a3f0234778b024455652acccbf.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_7594b1caf51b4ee38fa478f6285aa34a.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_0d339fee227145539ef0276bddf4f54e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefagolom/siriketulufibije.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_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 5196 bytes
SHA-256: c285178f980effbf817581892b0d4e5e66b627faee87e7214be6b5e724595457
font_01_sfnt_off00012a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A36 10564 bytes
SHA-256: 8ed5615e8ef0ea342761231b4ac8a8f83aa9785454f11d6105d1cecfd844c5cb

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