Malicious PDF — malware analysis report

Static analysis result for SHA-256 edba00ad8821499d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 17:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47eceb401db4b9d713a4d4287599211b SHA-1: 00987b50923bb0b10fbeebc3a9dcbfeed65cdc3d SHA-256: edba00ad8821499db55c436af345019b513dd2397c1abf8f8793c39c565ce9fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to distribute malicious files, with numerous links pointing to PDFs on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://euforbiabulgaria.com/uploads/pages/files/nolemigadokusexed.pdf In PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/44705320393.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/26117622338.pdfIn PDF document text
    • http://orlickachata.cz/files/files/48516642479.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/nozitigokijajegixoxet.pdfIn PDF document text
    • http://schokofontaene.de/idata/pazikexeb.pdfIn PDF document text
    • https://sergiomauri.com/images/file/94993713794.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bb71acf9---wesedokazofitopi.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/42663174874.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/95586394179.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/lrvk20adji9qq40ttrrvtvpcvd/moramazizus.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/loxerukisojivuxefij.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/pebefopazirakedafunep.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/safolojo.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vuwipubivuzavasokoje.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/mijajemevepazowejukeliwij.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/bukigupaf.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/60281792506.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/24594958651.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/jarepavalidufetuv.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/gaxifebizazujevore.pdfIn PDF document text
    • http://18554080.com/userfiles/file/60863239249.pdfIn PDF document text
    • http://epmachine.ru/d/files/89213714770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sicut+locutus+est+bach+pdfPDF 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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 17740 bytes
SHA-256: d35291872e9fdf2b560945d8ebc7475f84920d724fb50ed268000224b4e8c8de
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10828 bytes
SHA-256: 03fb7c93694df64bdaae2d042b4d020f0a1d0deefa1fdef6a7fac185755a3204