Malicious PDF — malware analysis report

Static analysis result for SHA-256 458caab61121e2de…

MALICIOUS

PDF

91.2 KB Created: 2021-09-18 06:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa5f0741251818e2a7a54cdfec6c3d48 SHA-1: 589d7a4127d87c11963c9eec5dd7774acc865ea8 SHA-256: 458caab61121e2de812e8965aed53add35b68db141b41da6d3cccc2a3910f8b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to download or redirect the user to a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/xotipadasizesebopexewi.pdf In PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/34145940797.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/nedajekive.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/47473697496.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/90672619605.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/poxovoxoku.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/37992296153.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/50728534056.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/88935764400.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/zulez.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/98690200711.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210901_A2C73C887EE1F330.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/92843108544.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff28058fd1---risekonuxavasuz.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/53210745052.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/bugoxexujaj.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdfIn PDF document text
    • http://farmina.ru/uploads/files/39516629448.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/5276955043.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/63521830598.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/mivobinatulenulawemaziro.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/22042992940.pdfIn PDF document text
    • http://clingac.com/d/files/dakuk.pdfIn PDF document text
    • http://fullx.net/files/93272057928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ninja+saga+apk+offlinePDF 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_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 18232 bytes
SHA-256: 4ee7856ddb018f90012a80b5f5e2c655d470824fdac4052ba993b23bb6683a5a
font_01_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 10532 bytes
SHA-256: 2f8436ceb2dd0e10040c36adcbdb164e7d55964a591de3a9ac314d4426b2697b
font_02_sfnt_off0001474d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1