Malicious PDF — malware analysis report

Static analysis result for SHA-256 8700a9f2eacaaa5a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-25 20:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f85893ff62c0506979df1ecd1d91c7c SHA-1: 121aac2d8347aae04deecadcb45105c318a08f88 SHA-256: 8700a9f2eacaaa5a486d0c4edebd154978bd1b8cd0fb1f1cd5a9774a01ea1657
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links among seemingly legitimate ones. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://freeware-software-download.de/uploads/editor/file/44983466704.pdf In PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/72676940986.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/wulubomakuporala.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bbjk5df8vf4dupdfu3l2qq3ma/92953760286.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/mamijidiripo.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/gudezeragu.pdfIn PDF document text
    • http://bndweb.nl/upload/files/lopimogimu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/fifiwidazakogofavolo.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/98231718503.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fomalanifutikiwaf.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/muniboligixoriretim.pdfIn PDF document text
    • http://portableandcool.com/files/files/jijulevifupetat.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/nujuguvatuxuwilizaz.pdfIn PDF document text
    • http://renknh.com/ckupload/files/fefubixil.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/27010259336.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wijeledalokexonulewika.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902001334.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/xasokapevojanirojexep.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/25175787325.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614479a20a1ba---titukun.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/vepovojapuzuvojepafufi.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/pukopejikisobowufidora.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614d21ce635a5---wokirawepevi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/5054813745.pdfIn PDF document text
    • https://spyboarcams.com/files/47679242777.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/26871517316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+denial+of+death+free+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_off0000c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C6 20824 bytes
SHA-256: 832b73a0076897cc0180e81d104eb50e6bb914b891eee3e1ea859d87e80302d8
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10388 bytes
SHA-256: a455641ac789c1fe72d441388993076ebd8281031ee83977239e9640a6388052
font_02_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1