Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5961fd884718974…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 21:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39f8a5d6104548d11ad11aacd9592c44 SHA-1: f7b6dd7b8af63475283c2800fbcf1d4aecbb45c1 SHA-256: a5961fd8847189746e9541db52254e10b35ab98b53f9c35f8223c9af646bf049
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains multiple heuristics indicating it's a link farm and points to a raw IP address, suggesting a phishing or malware distribution attempt. The PDF itself appears to be a lure, directing users to a suspicious IP address.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15cd715ac---linejukinugexuwo.pdf PDF link annotation
    • http://an-professional.ru/img/files/file/24804332421.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/32689941610.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/nozineforebonolid.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kabagusokutoresenutuvig.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/xomeden.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/73487678174.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d30cbfe5---96446237760.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/dusimipijegumome.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/16301742927.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/fozejidi.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/28791935016.pdfIn PDF document text
    • http://erdbau-rauch.at/kopatof.pdfIn PDF document text
    • http://aprt1day.ru/file/52410618835.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/45376894614.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/davigasomolaketo.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/54764951070.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/teketazezote.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zizatadobegafewop.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/fivuzafavivadamuvuga.pdfIn PDF document text
    • http://hidropro.hu/upload/60243500870.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/10213662220.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/pumetamebo.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/febub.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/79538465209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convert+json+to+gson+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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10604 bytes
SHA-256: 9dd64890b88f17bdd0393e16db636d0436b236cea1c60b98af20bdb2ad788c0a
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 21280 bytes
SHA-256: 2a97c51ae430802243e98fa0afeae2d9235f6a9a5a16702265c1e64252d2c8eb