Malicious PDF — malware analysis report

Static analysis result for SHA-256 91175aee7d208f5f…

MALICIOUS

PDF

118.4 KB Created: 2021-03-04 23:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b1a4a5af42064537cf32b94fa07fdf95 SHA-1: 444a6b3dd1b595b65ff8c15700057438f2c73e84 SHA-256: 91175aee7d208f5f061e5b7f05883ea0b89ea79403aac94cde86c5c7210f29cb
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=korg+x50+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/tozerutiwezu/dhjWsL2/3d_printing_metal_laser_sintering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_603a5635ca98f.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/idYgdhi/gatibo.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_to_make_a_book_jacket_with_paper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_602183157a7a3.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/sezabuvejivemunajukowi.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/heFgeiY/led_control_box_12v.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/dDheVij/radio_en_vivo_mexico_noticias.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_07729c0d00b548b498901f62b5be124a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/astronaut_cartoon_template.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/how_to_change_my_address_for_child_support.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_fbc73293985341c291d004481ae6767c.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_58cd9f7aed594b848ef4ffe40c73262f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/38836381076.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_7f476ba7f8db456b9e011b838263633b.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_140988590e614da1afca403611f46fe4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/62650759628.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/dizujunenur.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_333fc14d2aec41d881cc2ccc11acc664.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_fbfdc63e63614bcbbf72b7375c99d439.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_off000191b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B0 5652 bytes
SHA-256: af4dec8484ad15cc5a82724125d5b8b35adf9b5c4295e0c46ce71bedb71b111c
font_01_sfnt_off0001a4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4A6 11284 bytes
SHA-256: 4d1aaeb80e6ad7fa7837f7c9c6c3dca2b12d3f0c87885c6ac279acfaa23b0a18

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