Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c42c41dfa09dd60…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 01:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 388dac652d847e1e99005fb4f8cb6487 SHA-1: 4d110fdadc097ba21467e6cab4f81088c9e681a7 SHA-256: 5c42c41dfa09dd60cb1b8826dc509a2c6e51f3681912b58ff6f98541b0d96f26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm on disposable hosting, likely redirecting users to phishing or malware sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://catamma.ru/uplcv?utm_term=moto+g5s+plus+android+10+update PDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfcfc88f16---xejijabekusabuditizenari.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210912150803.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/zibijobofopiloniliku.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/kafepetixerawimuvulipotit.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/tafasefivuvexiv.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/nunivu.pdfIn PDF document text
    • http://aromata.ru/upload/files/12221168962.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/32342463662.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/53999414584.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/28859531456.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/boxerovedilulafapirojeke.pdfIn PDF document text
    • https://fototipia.hu/files/files/zulaluxipomogemifa.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/65307378633.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/29629924348.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/dofitulidiwolulini.pdfIn PDF document text
    • http://myphamasia.net/upload/files/58680342015.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/57707599203.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133412c2c687---farutesubanevajugu.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/34096781059.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/53992867982.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vabotatawokunufezusix.pdfIn PDF document text
    • https://theurbanthinktank.com/files/40193019962.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/28138909171.pdfIn PDF document text
    • https://airxps.com/userfiles/files/83260263642.pdfIn PDF document text
    • https://keongracun.org/contents/files/43088837153.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59294818566.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/rilejupo.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 10968 bytes
SHA-256: 9b6d4170d396f516a40649d298091c4754f0610dd7cf14f3d1daac437e42c19d
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 19608 bytes
SHA-256: fd80201f9bcbf29c3d49dcfdb2bf04835a7a533472858795bea244ac55afb68b