Malicious PDF — malware analysis report

Static analysis result for SHA-256 0343923674cc0966…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 00:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c27f2f6e2efccc06ca9d68ecc1ac24b SHA-1: 5ae349e53ef2f97ad30beb5811ecbce4b2439fef SHA-256: 0343923674cc0966989084fd0636da29331649be1405f6a26529fd11791a0841
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating embedded JavaScript and a link to an algorithmically-generated URL. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded JavaScript likely serves to obfuscate the malicious intent or to directly initiate a download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://woft-dining.com/webroot/editor-uploads/files/33813569694.pdf In PDF document text
    • https://artemishosp-em.tw/uploads/files/202109201527191821.pdfIn PDF document text
    • http://marketingnews.fr/images/file/28779127283.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/mivumopawarubejelikosuve.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b344af281---5926908360.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/tajubizi.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/nejepodudagapuguledufor.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/82527023285.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/98028389671.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9af09a81e---kilifol.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/1000616495.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/mokigabuxure.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/47664278365.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/61585344213.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/jizavafosupozirefikavugug.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/74746178641.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/fobizopezo.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/15011549538.pdfIn PDF document text
    • http://rld-carbon.com/file/zobujal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iptv+stalker+app+for+androidPDF 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_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 18824 bytes
SHA-256: 7a843751c7495635aca3cbc36cfa844a517c9fa8d0e3f187700194569e2bcd1e
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10600 bytes
SHA-256: d9cd78bd71465bece2abe9c358f37f0825961f9b17021dd0bf23848131f33e1d