Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b21afad3896fe1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 05:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a0bb7d1400774d386c944a137b6e6a0 SHA-1: b800a6b1c4b98beee423aad00c91625700bc8c6c SHA-256: 54b21afad3896fe117740faec04d86f2f120bac89fb1027d9bd7d5e0020a9e36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through SEO manipulation. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sm300159.agchost.com/userfiles/files/5672336872.pdf In PDF document text
    • http://chatfieldfarms101.com/userimages/funet.pdfIn PDF document text
    • http://vhz.cz/user-files/lavaripiropebud.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/watexewafativura.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99085395820.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/61905782126.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/31004902513.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/36341973799.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325a6a5196d---14756435659.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/47647736249.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/solezezu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/20240529079.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/jepokupomigevafomeben.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/12122347194.pdfIn PDF document text
    • http://darec.sk/files/files/kedokevumobuxofov.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vemozojaratadepelura.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210903_1DD372FEA7AA5328.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/jeresaremadotexapimaniled.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/kivuz.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/guvomazisefubijozibasu.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0475030001630745196.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/30854648380.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/56168887680.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/93282433496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fish+feed+and+grow+apk+modPDF 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10956 bytes
SHA-256: 2311cafd7d65eeb0a1be571bbc6b19f6427b1af878933141bfbe99e762b7c15b
font_02_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 18076 bytes
SHA-256: 2c02ee1651bf72a98f023a0a1dde7e42ef460a3bed89b54a014627faf4a4676c