Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20a8e39bc1f8f7d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 18:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1a0fdf7ad58ffbebd49cfe3e29340f7 SHA-1: 9a6f081aab0876ce1075caedd4c7dd7f5bc47929 SHA-256: f20a8e39bc1f8f7d73f50ee55936eac23138856e837e18fdbb9f6f62a6fdd1bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of many external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://silver1979.com/upload/file/benibipudo.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03e6e4588---fegupezunesozeluxutikumit.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/wukave.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/70196828844.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/92579884521.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/1338603795.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawezazexibixomuf.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/lavubuvaxosanojukatuxotab.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/42446894959.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32409334775.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/nufepakibafolemuget.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/2396583745.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/12199593602.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/matadukutire.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/rulasifelajubopit.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/zuzapevusolijatade.pdfIn PDF document text
    • https://kildevangen.dk/files/nikuzusokemojox.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133d80784506---pirovapur.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/20908762208.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/kewanulo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/nuwikane.pdfIn PDF document text
    • http://hidramaco.com/files/files/sozapevobunuteli.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/jitasaderuxuwudusofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+access+my+phone+from+another+phonePDF 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_off0000afa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 10796 bytes
SHA-256: 3e847d28925077e0754529faf4ea48202a937f75c471e6e292961d3be8a6fb28
font_02_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 15988 bytes
SHA-256: 758290f8e127145d58067682481ebfdb2ca24b4db5757f9856eeb500ac8ef6e2