Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d787231c49ce825…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 11:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2449da0cf4f13365f7688a72513b9396 SHA-1: 33717e91a0953ef5cc79bea1996e2a53fb35bc51 SHA-256: 2d787231c49ce825bf70cbaddd4398095ebd703c3d6d8dbf2c02e71c32a8c5c7
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to a link farm, with one specific URL identified as a disposable link farm on potentially disposable hosting. This suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ab402593---terelega.pdf In PDF document text
    • http://hepiran.com/cache/fck_files/file/gedefaxuj.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-18/20210918142845251208.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/dasuburatawasidawut.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/bejajujigokinusutuzife.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/wimovaxorejewage.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3f9d7c9ddc259e90271d8043b315fac6/mujikusaligogipame.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/10906737902.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/fikirolemu.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/57252885925.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/81057777049.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/69614123803.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/turixuwiw.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/saborujakigopoxid.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/padubonusilugomakolaxat.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/22473897986.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/nujakop.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/37772433701.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/77414055132.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/78124337814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=zombie+offline+games+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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10704 bytes
SHA-256: 2675281c4d342439c9947467f96ea63a428bb02d17f908538fb07b9228d4d164
font_02_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 17536 bytes
SHA-256: db18d176d39857c62e0475a45b43b780c4e991a92de58b2ddb8bdfef1e0cf436

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