Malicious PDF — malware analysis report

Static analysis result for SHA-256 97db3fa180ef7b24…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 22:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4efdf209e55dae7febe8d62123f77bdd SHA-1: 17d7b2fcf633bffc7e1e1bf54f489709a0f1fd11 SHA-256: 97db3fa180ef7b24e762d3fd8dcef1de89e3d0370647b1ed4ad5e3c29602a267
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many hosted on suspicious domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://skupka23.ru/upload/m/69175637386.pdf In PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/44102937496.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613052510a09f---96843302236.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/letusagodu.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/xufuvemokubewisid.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/58711210610.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/digiwasof.pdfIn PDF document text
    • http://cpviettin.com/upload/files/zemerizezuxofosavibenefo.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kijufekowesozilunevadojo.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/repufeze.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/68342968553.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/jelalokuv.pdfIn PDF document text
    • http://inica.org/files/file///lunasetenodevasemakeki.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/tafavuled.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/tivug.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/68658914948.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/derokalixewewegoxiwuvop.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/4524243124.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/48442374729.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/52110432567.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/lixanodaxenos.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/59618710199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=clinical+neuroanatomy+made+ridiculously+simple+5th+edition+pdf+freePDF 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_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 11264 bytes
SHA-256: c193d46e96b1ffae57cb99a1f7aa0d2cc2978c1d985169d1f90c5f40e235df59
font_01_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 18128 bytes
SHA-256: c36df34b11964aa6015814b5e55b638feff16ad8ee790d48e03decad76eaf248

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