Malicious PDF — malware analysis report

Static analysis result for SHA-256 130127d3c7f9a402…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 23:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c58a3d21b89552cb8ecd64556bb53842 SHA-1: 4b871058e7c6ea1c1f89c6eae9253951009809d3 SHA-256: 130127d3c7f9a40208849f7ae674553339e9e283de2c36493e7970462d0e8f5e
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of many unknown URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://doanandieuduong295doson.vn/namthuan/images/news/files/30253309413.pdf In PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/28021415691.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/sejegorujaw.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/xiwobigukuv.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210918135447.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_185846.pdfIn PDF document text
    • http://cochemical.com/upload/files/jubosobirivobu.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/jetuloxu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/81747602164.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/tosowixekeja.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/68858953872.pdfIn PDF document text
    • https://vzglavniki.net/data/file/21820939767.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/50642498747.pdfIn PDF document text
    • http://dansobentre.net/uploads/file/96218659808.pdfIn PDF document text
    • https://blv.by/upload/editor/files/tipigumipabunaberejo.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/garexured.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614990f67f114---40878532353.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/jirajavopojakobar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613908f156ffe---59816486488.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mefemenudadur.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/82990711843.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75537244828.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/87065822334.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/kifebisowoputolumi.pdfIn PDF document text
    • http://cochemical.com/upload/files/tokejexamipopejilug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=inazuma+eleven+go+strikers+2013+download+android+megaPDF 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_off0000b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 11412 bytes
SHA-256: 86f15633e32652696dcdb9883b52cc10d5e8e0f1035fd1d818c7a60aae8cb3af
font_02_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16236 bytes
SHA-256: 95a0192e61de4c4d0b50aecda674c8c02ce56d87ad4bd5d9691e1b763f4397f0