Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa7aa54599ac22a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 23:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a3f4ca617f38b9064ef1bebb6fbe4825 SHA-1: 65af04256805157ac84054308314d58b6ce5273d SHA-256: ffa7aa54599ac22af5fae5b445f2776089bb6b7a0608e346a6ec440e98066506
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ricarda-allegra.de/userfiles/file/zoxesapavukagopeniwune.pdf In PDF document text
    • http://kopdesign.nl/userfiles/file/70857979240.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hs9ul1bq4tut0atnjs9l5qg203/kisutulikomemi.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/42913314859.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/62971887568.pdfIn PDF document text
    • http://bankerz.in/qpic/files/77886741463.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/febasovulegaguru.pdfIn PDF document text
    • http://chapelguild.com/images/usr/12008378242.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/74669110534.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613280c800d43---1976225755.pdfIn PDF document text
    • http://agro-partner.com/Image/files/66728656110.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18910518617.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///84548577513.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/11386487158.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zasanutefuw.pdfIn PDF document text
    • http://portableandcool.com/files/files/tiwusolozuxugazopugus.pdfIn PDF document text
    • https://dm288.rs/slicice/file/suwazuraxex.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/puxunudukoniwujovax.pdfIn PDF document text
    • http://rayanchem.com/d/files/jilam.pdfIn PDF document text
    • http://splogservice.ru/content/files/87302999735.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/6247853.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/40494912648.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/digifaxiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=default+font+of+androidPDF 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 17872 bytes
SHA-256: 8143a973e9a9d29596a2a2432d1bf0acc73171f78d3767db511ef4d526f0e6a3
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10280 bytes
SHA-256: d4fa64f885bcc7bc646ef2889fba9d3c4c0940b94d5d6e0ef4c2da28a8d46f37
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1