Malicious PDF — malware analysis report

Static analysis result for SHA-256 773c9c3f290d67b3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 06:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e136b41f626e8faf28eb4b8c43d5888 SHA-1: 105af4df4318945f77dfbb1f5e2c5c17e0b9aa47 SHA-256: 773c9c3f290d67b34bc0073db069675348149b80184b22c07ca5780d912354a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and numerous external URIs, indicating a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=major+rivers+in+ancient+china PDF link annotation
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/13fb8ed64d4563c0d6b5b16d5d20f5f4/28009467602.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/39905311191.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/wuvefol.pdfIn PDF document text
    • http://sakem.org/userfiles/files/toliwowapozijejitip.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/44843584730.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nujivunilivoke.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/jevirabodutimeluzel.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/xivetodo.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210911_F5193DE2BFBD6959.pdfIn PDF document text
    • https://aildf.in/userfiles/file/wolifedebisisokidi.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091518592059.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/vamug.pdfIn PDF document text
    • http://kme-kme.cz/files/file/67880739113.pdfIn PDF document text
    • http://zubrcup.by/files/files/28645072869.pdfIn PDF document text
    • http://snsi.jp/image/news_file/xizes.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/72311428045.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23184933889.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/muxozulozat.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/93595584374.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/8324219082.pdfIn PDF document text
    • https://isleo.com/i_photos/file/17566763984.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/tulowepo.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/wusawomagiv.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f939979f95---31112451731.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_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 16556 bytes
SHA-256: 414632ccea9e2fbed08bbea7c28d80f6a39786cf4baf2b17c1f318269b00946a
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10468 bytes
SHA-256: 48aad449f2525f75416747bc82168041c14cafe3c172769add2f2fca2b3fd5cc

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