Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf4259c650900ee…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 16:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e7d9d489a32e51cad08f32c46a6e117 SHA-1: 9c1f7d3d4aacb8d7d2707e9e0efc7f441b74a04b SHA-256: fdf4259c650900ee0c63f099af61f573227576b3b5086c2d6dfc0a95ca55b8d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://hediyelikhanem.com/calisma2/files/uploads/xudidofelebesom.pdf In PDF document text
    • https://ratoempat.com/contents/files/73589425387.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/nizagivuxabitabixugu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/jizakuvimulokelisiget.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/fabupurag.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/33633687142.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/fusori.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tjq3pkthhg52v09pgvbip4bcvohp2bl4/2253219952.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/62997094037.pdfIn PDF document text
    • http://teifsepahan.com/files/file/guseno.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/23199700062.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/37676978920.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/91990665175.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/kuzarubuzubonepovene.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/tejamekopot.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16a6e22ca---60873726582.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_195517.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/kawuzifet.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/64836607554.pdfIn PDF document text
    • http://gojjang.com/uploads/files/lamefibinusop.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/41309737793.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zagowukiwumedagepatifut.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/6802353814.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/4028932230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+best+gba+emulator+for+androidPDF 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_off0000b726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB726 16164 bytes
SHA-256: cfe60c7c4118d04594503995517f6fd75f01198ce4f84cfbd7ccd233ac6eb780
font_01_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 11032 bytes
SHA-256: 8d556cbbe176be2bfaa215f2e0b206d41da37a9c9657be745d9e113422aef3a8