Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba129f6bbcfe3c3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 12:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a1c9b64d7806d6d5b1d36ce44a06ae2 SHA-1: 13ffb146e3661509d93a7d02d81e48fda0017bf1 SHA-256: cba129f6bbcfe3c318077fd803eeb3c161e07dd8ea12f282a682936af6b7a98f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://kidneystonetreatment.in/userfiles/files/gibokomezefewekem.pdf In PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sazugatukigosugo.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/34521033298.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/jeduwukowatobux.pdfIn PDF document text
    • http://teifsepahan.com/files/file/rofusome.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kimosifojomewizaxusozud.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/sukagumimodiroxumele.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wasifupomajojagerixoxu.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/99940477025.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/65697502339.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/96304927223.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/83801576280.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/20375044952.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/41578697286.pdfIn PDF document text
    • https://phm.vn/upload/files/26503626238.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/8940478541.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/39437398248.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/vezoz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161389aab43b84---58146959679.pdfIn PDF document text
    • http://chinalabware.es/d/files/volaresesali.pdfIn PDF document text
    • https://red-adlay.com/upload/files/jorulowanumuxedijov.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/folikesu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pdoqgdk8tssj3gf9vbopie6a2q/1617585809.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/dowutozawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=transfer+photos+from+pc+to+android+phonePDF 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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10800 bytes
SHA-256: 1e670c47633afc0e6054be826bc2d5da9e21bb8455bc92e9101fd9219f23a791
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 18880 bytes
SHA-256: 4c049ec26f2512db209f341a8eda540d3fe0a56bde73c27b869f0bd4f5b1cf13
font_02_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1