Malicious PDF — malware analysis report

Static analysis result for SHA-256 70380c01ba5e5725…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 16:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df767737a32eb146d5f13ab5dcc24d0a SHA-1: ea9f45383d96f8b4ff607e0de6deff036c36a68b SHA-256: 70380c01ba5e57257b29bf5c087c61c9c63d5f99be4e677e453ca4fbcb75f73b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=user+agent+list+android PDF link annotation
    • https://robindayne.com/ckfinder/userfiles/files/xivovexeguvupojivarujuxe.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jidejas.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/81770908417.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/75758216152.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/fumiridalijif.pdfIn PDF document text
    • http://anpo.vn/upload/files/tisavaxopezonapujotoje.pdfIn PDF document text
    • http://etkenkalip.com/files/rodawezidelelo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/3611824952.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/41228103931.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zanoxogoje.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/99692263856.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/5544644504.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/felajadilavisidegupit.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/xedojuzip.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/dipapigivoxefebotepumebir.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/mogefa.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/42666295551.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/femewunajivopuwikupirur.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614474da44da0---lamame.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/11721106006.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/rasojadaforibazawup.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/lerezejonujivuxubigejoxi.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/39142762287.pdfIn PDF document text
    • http://flirdining.com/uploads/files/43013104840.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/76137611001.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/14317094018.pdfIn PDF document text
    • 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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16512 bytes
SHA-256: dd43b94c1a28a8e2a35bd0b5ff33bda5dc3f1b91cb1d95b179ee470c4c138dbd
font_02_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 10432 bytes
SHA-256: 64ef7348e6c8a18be4cf3fa71446fd1982518538697a4af7765ab84fd53e2f8e

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