Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00450a7fb4639e3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 12:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 06488e02af6a9307c1a1d95f2b899994 SHA-1: d721823b9823d209e76706de3091eba8b48bc841 SHA-256: b00450a7fb4639e341bbecb17cddccc94b1cdcfab972985439d947807c3a03fe
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this as a tactic to obscure the true destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gs-metals.com/filespath/files/20210903215130.pdf In PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/gobezonituvipilunujuwilig.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7f65a9a5a873b2b61999e74c74dae35a/sizale.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630494947.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/luvopovuwije.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/nugulowuzebemekivunajamav.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/67301726820.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pulevut.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/tovusozenizugiso.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/gosaboputuza.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eccfd91e5d---xadawusefapesowunumogu.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevuwisi.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906135149.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/97282996749.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23262295706.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/leniguwexebovofa.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/97108945090.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/4954073294.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/supapupapuzutuzokekewu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/mevif.pdfIn PDF document text
    • http://haai.org/upload/file/jetapopidedaxogedobap.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xasofifigokudavot.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/rovofajafajepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=political+game+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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10544 bytes
SHA-256: aadb6e94e15a75f07a0c570e1fbcb0df8a2a4b173cd2cee15848251c9c646570
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 16992 bytes
SHA-256: 00643ee45bc1a455f58afd2fcd9f0cb72617b7667bcd38d1910397c5948bb9b0
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1