Malicious PDF — malware analysis report

Static analysis result for SHA-256 0941627ca2ed76e5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 00:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b710025b8b3384694c115fa3f21c173 SHA-1: 8864b4d2257d8a1f6fd567d82979839b14a94330 SHA-256: 0941627ca2ed76e5c9a1e717077e43e6b0681a46fa1687dfcb64432fecc318ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is intended to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://roshnaai.com/ckfinder/userfiles/files/62986961618.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ec289a97---83404180439.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/77937095924.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/bepoguja.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/xadujexifizomego.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/61042725466.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/sivapuzutavu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/99052851315.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/21907729406.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7c399fe46f30a37f4479d44ba02e2053/64183881123.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/52182724061.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/39348317764.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gufad.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210903235204.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/2723089680.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/10713572724.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/navif.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/30892486152.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/1612973834.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/bijime.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lawewogafal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=avatar+the+last+airbender+the+search+part+3+pdfPDF 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10956 bytes
SHA-256: 563c7828b49d537042472d9161c3fd769d323d8966049e7ffb4a25ce1d14231f
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 17352 bytes
SHA-256: 1ff1db7881ed04e37163c89030e0d50b10248166de44c343b066e1934300d22b
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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