Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19faed9d61f82a2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 10:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 531b8de4914e80094d92f93a90e5439c SHA-1: aab887262c253a8482b157e71beedf9c2bf98bce SHA-256: e19faed9d61f82a289c9da5565cd5207f5f544dbb5f84f0f3f770f2cd7a2800e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, presenting numerous links to other PDF files, likely as a method to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of disposable links for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lamekatus.com/uploads/ckeditor/files/baxetirujex.pdf In PDF document text
    • https://alrukn.co/userfiles/files/13885573757.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/lixotupabumatuvu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3d976b1520b02b008432c56425c44bfc/niwad.pdfIn PDF document text
    • http://saimiri.name/upload/file/boxupebozuxajeroma.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/rovaxa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6bb8a6ec---ruwanefozafetizatovozane.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/wuroxepibijipulagika.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/62636704685.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/49644473241.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/fased.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xujadoku.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/17715104654.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/89707396135.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/45958342432.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/vutipu.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/81214196901.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/23358427677.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-03-12-37-17-Qx36q7Yt.pdfIn PDF document text
    • http://dsraxys.com/uploads/23320910751.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/50270472319.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/14213226579.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/5274992022.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///82783285018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=metro+2033+book+pdf+free+downloadPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/50703354537.pdfIn PDF document text
    • 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_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 20556 bytes
SHA-256: 97bccebdcc6058a8c5154e6308c9d057342d2dbac19bbc9d74335391174ca13e
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 10956 bytes
SHA-256: f44412cf1a0b3b883165733c45217c46cc1fa6797e78da692e761853455da810
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1