Malicious PDF — malware analysis report

Static analysis result for SHA-256 050b912661ed261c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-10 11:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f71f18c9bbe624e58ca5089ffc8592f SHA-1: bbee6d1ed87ace01a81c4fd3073917697d085354 SHA-256: 050b912661ed261c05d2bf41ae83b7ab889232e1ca0ca529ef40ce854b011dfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the sheer volume of suspicious URLs suggests a broad attempt to redirect users to potentially harmful content.

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://queure.ru/uplcv?utm_term=mohra+mp3+song PDF link annotation
    • http://www.vinoplaza.nl/img/upload/files/roserisik.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/40484211530.pdfIn PDF document text
    • https://robertbah.si/files/file/68791170037.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/98299021823.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/29900917932.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/pifunajewiwepubonut.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/1621089926.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nezafumud.pdfIn PDF document text
    • https://badrivishal.com/media/dadujemevov.pdfIn PDF document text
    • http://vhz.cz/user-files/lavaripiropebud.pdfIn PDF document text
    • https://dafelia.com/files/66583650188.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/tedaborujuki.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/kevaz.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/xurodurokesesajikifevog.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/gejudoxunop.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a710a0238---99929454501.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/45288494890.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99f4ecd6b224ae083dcace8e92ecc617/49559456460.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/riwukese.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/44971433563.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/deselunigev.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_off0000b617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 16952 bytes
SHA-256: ed160e69541a2740bab41317eac65048e8e4b839762a139bd6c9ed68021025b8
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10496 bytes
SHA-256: 115acbf20b850620a97c3d7dee1ef13689a0abb3f24c661aea8914b2dbe13290
font_02_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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