Malicious PDF — malware analysis report

Static analysis result for SHA-256 8612614fd59e8286…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 16:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9468c1e37cf096bee49c42fe05c359e9 SHA-1: bfe987f05b471d653db27a7c2678818dde789406 SHA-256: 8612614fd59e828624b363bf1db7d8007657147ae7cd811dbe2dd6ecbb367b8e
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm on disposable hosting, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://e-ceramika.pl/userfiles/file/22081256601.pdf In PDF document text
    • http://sasolution.kr/userfiles/file/zaxavaritamaruwage.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/11474568410.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/64919000838.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/54791549080.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tegukawa.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/38414057713.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • https://sanagustin.cl/files/mivatiwavekanetevirof.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jakodagefuwok.pdfIn PDF document text
    • https://ibericadearmerias.com/file/75851121636.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dusejuwadefebelugonopixu.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/lufubavidofapafodo.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dabexax.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe456bcf3---69516908451.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fosexujereg.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/34842600855.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/toguzuligidozipadigebari.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/norilonapejimalinewesaxav.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2610933993.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/wudawenabipofarelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=3+examples+of+operating+systemPDF 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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 17292 bytes
SHA-256: d4701dceff7619aa3e5664f48ddcfe82568047cecad00aea4500bb54998759fc
font_01_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10992 bytes
SHA-256: c5b27c5b1089f3513900ec86836a494fb9b67402607b0380cbbb2a04fa422f11
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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