Malicious PDF — malware analysis report

Static analysis result for SHA-256 889cc8c3d0713fa3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 12:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 702846221534a3c5f728a1f99e0b2c28 SHA-1: 3d68dae0d79c87e8f875259c44eb06ea835dbb50 SHA-256: 889cc8c3d0713fa3368de39660fb58ebe9428c88ccfe06befadc08458983b2ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://marblo.ph/app/webroot/img/files/90922092727.pdf In PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/27410532527.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631731083.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/45360134831.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/64589875592.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/wegejakije.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/ropejunor.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/xejawila.pdfIn PDF document text
    • https://primer-spb.ru/files/files/gamofif.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210919095716.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/34921619526.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/josefinenazeworij.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/94917157269.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/68387700943.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d4dae38c---40597131069.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/federifogavo.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/miwiwibanixofixekonoxewa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xijorezibogajopu.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/mikimowerukosek.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/nobope.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144497073e28---mutodefarewitoj.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/sokaluniwagu.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+phone+does+not+want+to+install+appsPDF 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 18296 bytes
SHA-256: 7dcfda4d7cd3ddce1ab5d3f4d9726db2e06facddcf2a9c288976a8411dd0a5ea
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 10584 bytes
SHA-256: b21b8d641296f2c3ba2efc1cf66390fc8167c91c5fff74980f77f7a307b6a040

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