Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c53e966496a9ac…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 19:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83db91ced6f4eade59d5e379a4d3548a SHA-1: 3f531902ad8c00b2bada7f02bad71f972927542c SHA-256: f1c53e966496a9ac2f369a0cecd775b04c2f62598eca16afb16964e95c5e7b1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with many pointing to suspicious domains, suggesting it functions as a link farm or redirection mechanism to external malicious sites. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://testpensija.bankai.lv/ckfinder/userfiles/files/pezuzow.pdf In PDF document text
    • https://mldom.xyz/web/img/podborky/files/81571873862.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/bovosabojepajukuxokujub.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/69402492603.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/34492095718.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xutiwewusuruwalefijus.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/29194997785.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/wopevexutofegajisotur.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/xatidigotudi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132953d6e1e6---jegumosinuzebivumexabunem.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/200794019.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/pinafegedakafenaladuba.pdfIn PDF document text
    • http://grimastone.ru/files/47405757230.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zopawike.pdfIn PDF document text
    • http://muszempilla.com/files/file/69278604195.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/pesalifudaretezu.pdfIn PDF document text
    • http://qdjshg.com/files/file/22317364106.pdfIn PDF document text
    • http://byecook.com/ckupload/files/joxilub.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/japatuburewigejebepedas.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lidizosolajipejor.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zifajumaxovoradugepe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613205af00b95---munumozupo.pdfIn PDF document text
    • http://lachina.cn/upload/file/2697723417.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/botajuguxiv.pdfIn PDF document text
    • http://grimastone.ru/files/96505744464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mediterranean+diet+pdf+vaPDF 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_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 10216 bytes
SHA-256: dba11d2ff958ec95e1fc61d7557f2f092c5925917945f10d12c1ab0116965007
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 17744 bytes
SHA-256: 84eb0b0bad62fc4064e51a5f347135d4dc411c0233515ad8bd9c05a53b541c69
font_02_sfnt_off000134c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1