Malicious PDF — malware analysis report

Static analysis result for SHA-256 f990a3609da83208…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 07:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 309c3324722936160046c01998107790 SHA-1: 6d48d7cf470ef730f539ed390148e1b31a648839 SHA-256: f990a3609da832084399999901bfa9f106858608a3552a377ac4ae61395b4706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a link farm strategy on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=enregistrer+youtube+sur+android PDF link annotation
    • http://turchifiltri.com/userfiles/files/xozib.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f59644501e---mokikovagoxirelofip.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/rutowedokemofevizux.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/49595650811.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/melatugukaj.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/946458396.pdfIn PDF document text
    • https://people11people.com/uploads/File/kujixawisukasowuregopani.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/76174058291.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/92463399400.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/xatejipulepazobogi.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/21040592066.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/60761375481.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/86259552483.pdfIn PDF document text
    • http://weingut-suppan.at/files/fasugujujarigopewos.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/85889481452.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/66907770113.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/70876844005.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161491dba89d58---loxofiz.pdfIn PDF document text
    • https://phnews.ro/files/file/zesumiterinasif.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63322903301.pdfIn PDF document text
    • https://onecre.com/images/content/files/88027467148.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/12480386050.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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 10716 bytes
SHA-256: 148ccf290e5dfc636a5ce1fb6b1cf2100bca3cb6daca4ddec1931fcb21c2dad6
font_01_sfnt_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 16132 bytes
SHA-256: dcb03ecc86b8b3faf797ea5a388deabab490e9c811a5739d501b03792dae4e05

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