Malicious PDF — malware analysis report

Static analysis result for SHA-256 b781c0ec6ead9436…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 03:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7aee40fa84342255dc56264c8c58446 SHA-1: eb91b3fdd55072322dfbce8cbceab9aa807a10a7 SHA-256: b781c0ec6ead94361b093d1f5902d5bd2019fb79b10700ea8f5d16ed99f9f468
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing lure designed to trick users into downloading further malicious content.

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://synerhu.ru/uplcv?utm_term=gta+san+andreas+apk+data+obb+download+for+pc PDF link annotation
    • https://cytokin.ca/upload/editor/file/25254265824.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jerasisajaropobobofaxatam.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/pawupogivelamujepolunafa.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/268326826.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/gufofakax.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/3871919222.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/kirakikaxadurizupozo.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/29324284256.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/janatepoxipobuzutemuda.pdfIn PDF document text
    • https://businesslife.com/content/file/88393599029.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/67891782880.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/tutubawagefexujisariniwe.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/tenule.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/309290924.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/renopekipatepa.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/mowuxopijuritivoropan.pdfIn PDF document text
    • http://surausa.com/uploads/files/vowinonudigubag.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/75291517582.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/54333357566.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/46915040972.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/23328006062.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/100119344003.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/kusakagemumo.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/woxuwa.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 18512 bytes
SHA-256: 84e4d4df49c18b2f8ab3152a3f17ff26e3dff8085031b8169ef12f17877f7b4d
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 10880 bytes
SHA-256: e6061eadc6936c640277d27d1080eacc146e64a2e1ee50700b38f9292d632a7a
font_02_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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