Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b275ac1c1ed3ad1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 23:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9641320a71862f4d65e97d3546602ac SHA-1: eb65585299a83197867ef18493821099f9e0be0f SHA-256: 0b275ac1c1ed3ad1e22a0223b898a66ec59e4103bf95850416cde8a53ac092a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=cpu+benchmark+smartphone PDF link annotation
    • http://hnsunnyfood.com/d/files/11719550109.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gezimamulogebixiruvukagi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/veretezulekikiwovezajata.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/12296912891.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/gudawisexutibojoru.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/90682936828.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/86841790869.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/dunowiwurutalewetezefala.pdfIn PDF document text
    • http://hidramaco.com/files/files/xefodolepe.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/42393271f9573befdc7dd32e5bf2dcce/30632074436.pdfIn PDF document text
    • http://labradory.pl/file/42319558667.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/71794839138.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/1503340399.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/88830246238.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hblibthaskjnqsk66c7e489mlg/pabudiboxaw.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/54119294595.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/kuvisam.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pimipuxukawe.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/9822798847.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210905_C56D17F996C63C5C.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/66290078050.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/60669901472.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/34149856690.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/wivamupajivukisizifudebe.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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10864 bytes
SHA-256: 27b47989ed3d65334ce35f2deecaf3552484373cf27cda38fa05758ca0e186b8
font_02_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 17392 bytes
SHA-256: ae8006341bd064f77f62a465829f15865b3a5e98a2635e74786604cc3ac1d503