Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c800b24e35050d…

MALICIOUS

PDF

86.4 KB Created: 2021-03-03 17:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ada769202647b3ddd1679aebf0e97d00 SHA-1: 1055af25e3881ffaa314d41bbbc05c3a80f8e35a SHA-256: 33c800b24e35050d41a77ff2b792889f9deb49ffee6bd948b29b9263028790f8
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://mezovuduw.ru/123?utm_term=how+to+draw+by+scott+robertson+pdf+download PDF link annotation
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/a97af9d3cd.pdfIn PDF document text
    • http://subonus.ru/545090498299xdcg.pdfIn PDF document text
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/7359602.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/63097984432.pdfIn PDF document text
    • https://cdn.sqhk.co/kugoxepif/cZmhdgc/storybeat_premium_apk_free_download.pdfIn PDF document text
    • http://select-get.top/79810853177i6vkg.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/e4j5NRF/43362462303.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/f8f65b62c1d2.pdfIn PDF document text
    • https://lubavezutumeji.weebly.com/uploads/1/3/4/7/134757539/zilagoxumikurad_lafofebuleku_zelux.pdfIn PDF document text
    • http://vandify.com/net_and_gross_weight_worksheetahrjp.pdfIn PDF document text
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/f31c4f43ecaf18.pdfIn PDF document text
    • https://beziremisolexew.weebly.com/uploads/1/3/4/6/134656792/5d7a45.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/Qjdkxhd/atlanta_home_restoration_company.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/4614217664.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/pIjf4cv/wubesokovekupopiwas.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/688843.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000118c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118C6 27632 bytes
SHA-256: d3e4107941e28060acc299315e785c61a9ea3de72d7d774fba5ae469e3414f92
font_00_sfnt_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 5444 bytes
SHA-256: 5622b801962e8b967858bd0de5f562c27d01a121c0add8565aa0f63b35ddda43
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 11780 bytes
SHA-256: aee9554df8b97ff528242e8fb715b6bb1544d623b1a3f843552afca1c1e19326

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