Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e174e1d2c58da3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 18:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59a9f8a4254882b4786c95c68a72c68c SHA-1: 28a188a3f14a6a61ec157801f3740b15322d3bbd SHA-256: 52e174e1d2c58da3a3e598e193a1ba7e3f2bb75e72618ee3e54cbaeac4e9f8e4
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 external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=reset+ram+android PDF link annotation
    • https://beautydent.hu/editor_up/77657151248.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/jexawipu.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/jelijoxupameresex.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a24a0cd65f60c73082763811eea4ad4/61436564040.pdfIn PDF document text
    • https://digireg.dk/upload/nixekovogemowixu.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/lulasago.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/mijelofeguvane.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zutiwisoxupobawago.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/46664631501.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/pokofeseniviwapow.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/tixin.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vizexorudukuw.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/69415786690.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/vodosamefuwifawitimawef.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jipapigonekadeso.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/rodiv.pdfIn PDF document text
    • http://schokofontaenen.de/idata/84237153597.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/vuxudofibovupenujirofisij.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/caavu8htlun8be2tuq5qk2c5kp/76084641782.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/55327598005.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/paduzafowoboxilisoje.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fogaxuw.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_off0000ca2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 17272 bytes
SHA-256: 195146b6ed231ed2b151be92b194abde50e7d2a17a52110c8ee7308d0796038e
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 10408 bytes
SHA-256: 4510b9905e64830c3f17bb04c192cad37f47d1e753a5ee6b4f45abe0372cd2e7

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