Malicious PDF — malware analysis report

Static analysis result for SHA-256 df99c764fa3cd4de…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 00:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d9809067ce10e61eca070bd04ba380c SHA-1: efba69ff54ac16d05ed93b93219ce063c725c696 SHA-256: df99c764fa3cd4de0bd6bd13fcdd225c7bb63922fe100fc86792d6bef29a32cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ilonew.tasksplan.com/ckfinder/userfiles/files/71543539067.pdf In PDF document text
    • https://apluskleaning.com/admin/images/file/92677009818.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/94752242080.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/67496646401.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/5205600559.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007d6ea95c---napeluduzoderegugidisegud.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/94339324799.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/jijijikatadejejizijopela.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/rabenutidi.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/bolukozovojidapijepareze.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bovopasenibej.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/kupax.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/64093411888.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/48ec0boat5kk8auqn5qe2lnl5b/76535314442.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/88159722222.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/jozixen.pdfIn PDF document text
    • https://kildevangen.dk/files/pifosejofo.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zupetubakolatazevesu.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59700395695.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gadibuzejebinozovomeb.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wokipuwakofubiwobel.pdfIn PDF document text
    • http://zuche0551.com/upload/file/77029812241.pdfIn PDF document text
    • http://alkanboya.com/files/file///rinutopidifudofiv.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/7719200998.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/41784867371.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/kubomijolut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pathfinder+2e+core+rulebook+pdf+freePDF 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_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 11004 bytes
SHA-256: 70177f4c318f052cfe9ba8872f16359d18f7fc52410146e25b7c25e3613be4a3
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 18132 bytes
SHA-256: efe222f4c002538e6ecef281294f02a99f2b22dd19e0035b0d3123939583b41f
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1