Malicious PDF — malware analysis report

Static analysis result for SHA-256 75256933d74cc37d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 21:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbb478ffd326be0fd54badaa563b63a5 SHA-1: 5b4b82cc2c6e3b8429dc679f5ef3a6fbfcb55601 SHA-256: 75256933d74cc37d75842318d705978138a917a3900c1648fbb23d1dcd1308d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The PDF's structure and embedded content indicate it is designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mygoaltv.org/ipp/images/uploads/files/20153011975.pdf In PDF document text
    • http://trust-law-firm.com/userfiles/file/20210913152144_1662619621.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_084752.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/49626025180.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/32ac274365b9238e713fecea7150e2a1.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tatizisixezakutepomudepa.pdfIn PDF document text
    • https://retta-bg.com/userfiles/rubuxixuzuzisepo.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/movusegifililirozikerunog.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/fazuwixomelebasojevisa.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nubibimuxus.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/fozewiwadanane.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/wejawikizonevajefipi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2932l0a5dkqrl7tjogimo87ml1/33477570034.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/45607900528.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/rumuwerusuwibevojafogi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35589319659.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/paxemupuze.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/21889656.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/79326944359.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136de187d231---73029608844.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jubebesezakimitumugugu.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/39236911603.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/2203346435.pdfIn PDF document text
    • https://menu2uplus.com/images/file/8075840090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+install+theme+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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 19164 bytes
SHA-256: 3acf59296344e03415ec42c01d35522b7c0b25f154aa3144cdf3af6d84f3a9ab
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 10696 bytes
SHA-256: d4e56cda28ccce4a879736029ed4dbf8ae3256121d574454ca28d1ea5588c65c