Malicious PDF — malware analysis report

Static analysis result for SHA-256 662877599d899734…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 03:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a7233e2d33aa26373949394a79147af SHA-1: cdb5e2461397fd89390aa74f2efd31baa3b5de2b SHA-256: 662877599d8997341cfa2fed34a5a48905a26baf30974606b9c6eb36da11ce35
124 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, containing numerous links to external PDF files hosted on various domains. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to distribute content or phish users, likely through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5563

Heuristics 4

  • 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
  • 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://industrialdevices.in/uploads/54356006627.pdf In PDF document text
    • http://diegogenna.it/userfiles/files/fukuzejogizexo.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/15067405865.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/68504360279.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/42706281927.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210915154757429905m6l05e.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tubemogazosuv.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413844b8290---fenulokuminasogodu.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/19194487385.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904053442.pdfIn PDF document text
    • https://ocw.tw/uploads/files/vapefomuxaz.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/dugobokuvolimefeti.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/volapafikisukuse.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/lekuguxisabafipuso.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/xewobena.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/57513815828.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161429b255bb0a---56564370905.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/mofelil.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/bivizozis.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/tavupa.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/moxepiveworoxavobetoduris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=harga+hp+samsung+galaxy+note+3+secondPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 18668 bytes
SHA-256: 61c5f81b31e63127cf1925c87be3525cc7ada1c05b1494cded16e39dbf3a6804

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