Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77721ad1031c2ca…

MALICIOUS

PDF

79.9 KB Created: 2021-02-16 18:38:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48f9083841488bcef30bf807492be92c SHA-1: d6bcadd33a464b7bc150c97413acf1b7f5aa84b2 SHA-256: c77721ad1031c2ca56fe0634f98055abbe9fd924ab644aabb43073a31d8e4017
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, such as game guides or manuals. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution, despite the lack of executable scripts. The primary attack vector appears to be luring users to download or visit malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=yugioh+games+mod+apk
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/zunanubukox-tozidoriner-zurufirox-sebizigipesame.pdf
    • http://momentshop.website/raxuzadugegijuralavujoniv1xiu.pdf
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/5910191.pdf
    • https://gawowulovo.weebly.com/uploads/1/3/5/9/135966180/muvudinovaz.pdf
    • http://swast-group.website/ivan_turgenev_first_lovecnvnq.pdf
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/rexifovek_toxuxegif_zenupukatifume.pdf
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/1c65c18.pdf
    • http://jibinomazovujug.22web.org/ffca_school_uniform.pdf
    • http://morosoxumexax.iblogger.org/55742779321.pdf
    • http://nuveclovet.xyz/xaremaruvisiwosuwuwadco.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/janodojivi/yasuo_jungle_guide.pdf
    • https://s3.amazonaws.com/somamere/buell_xb12x_owners_manual.pdf
    • http://kizozipa.epizy.com/debedinoteduvirawu.pdf
    • https://s3.amazonaws.com/befafuni/lodizitoxuvubo.pdf
    • https://s3.amazonaws.com/tulosa/kreutzer_beethoven_sheet_music.pdf
    • https://s3.amazonaws.com/minabiwa/alberta_student_aid_form_b.pdf
    • https://s3.amazonaws.com/zolerazowubow/certyfikaty_inwestycyjne.pdf
    • https://s3.amazonaws.com/pozokimepe/16077719945.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd24.bin
f1f8684ceb02d153a44ac6b1799d87e46b96b895aec227aa764af63cbc5321d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5272 bytes
font_01_sfnt_off00010ef6.bin
0894c6d8568fd02b2885e8ec69da0c659c6e1c9e9654ffc93f82f80c24f15d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 10476 bytes

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