Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd60430df20dfc18…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 22:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acabeb46a9e56e6bdfe39b07391d22ae SHA-1: 1c8d9aaf3b2cc4d8138e4a2c056aace9d0730d91 SHA-256: dd60430df20dfc181dc63ac8953db03039e5e9f3754421df3096f981e2a7093a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm by heuristics, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The numerous external URIs suggest an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/34287975631.pdf In PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/punuleraw.pdfIn PDF document text
    • https://0900107678.com/upload/file/napibaf.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec089167d1---natopifabelusojexod.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/8812352829.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/banolaxokilum.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/pugot.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/33366418880.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/murufefif.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/58385190628.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/pozenigozofexiwutidu.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/77526373140.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/4625884562.pdfIn PDF document text
    • https://arendic.cl/files/govunulalux.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/15517206520.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/34009677734.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/3469338064.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/29456874258.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/1426928618.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210904160409.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/89071274905.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tujavawoxumasusorovosikev.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/kezigimefodedixabasozok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=principal+square+root+of+64PDF 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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10964 bytes
SHA-256: dbfa21a6790e9a157ce7afa67a931c262e33371f45d54347e1573c7e0e20751e
font_02_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 17908 bytes
SHA-256: 4c4764deece2141717f1067ecf7c58c780ba8427095cf8dbe269a07b85bcb52b

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