Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f1bb0370f0b558…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 01:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 336384b7281268135d91f7c1b3e6c09b SHA-1: b4aa625f13cfecc20d749ef4a5198d7e57a6af93 SHA-256: 41f1bb0370f0b5587afdf82033c2ca18057385ffa148ece943e67de5ae0090f5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to potentially malicious or disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://whereestar.com/marinarubicon/admin/file/5012503010.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d22ddfe510f7d3722271f2799c5e2435/5422202698.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb4365499---guzeduse.pdfIn PDF document text
    • http://trieuduong.com/images/Download/22410816417.pdfIn PDF document text
    • http://baove24h.org/upload/files/7503416273.pdfIn PDF document text
    • http://chikatere.com/Upload/files/nefadidasoderudefizebat.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/56277736514.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/56894308936.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/nadixiniranepanetuvuxivin.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/daboxejebimapisirev.pdfIn PDF document text
    • http://parateam.cz/file/14346246051.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/70826671793.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/pixomiwak.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_198C90C5E587C9F1.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/60717026666.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/41213883699.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/tifabuxisunuxo.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/65707982235.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/47109721312.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210908181516711.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/naxonizututejufidixovovir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=excel+ocr+imagePDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 16244 bytes
SHA-256: a5f60c48266245100a8fa1b55ed1ec6189cc724909e47b3c5dea64b03934e6ba
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10288 bytes
SHA-256: 03ac0d93204f647dce6d2cec49419d796a55c4afd5dcb26a1e90ed6b7e2e4553
font_02_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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