Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17b51bb13cb0744…

MALICIOUS

PDF

88.9 KB Created: 2021-09-14 01:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e74379c3ad2d91b579e270766fe0830c SHA-1: 3f7bfd6305a12b93cb9765e96a9e0e09de0dd304 SHA-256: e17b51bb13cb07448ac09c6f728b6ed4637946c3717ab99f7afdeb6b4ccd7d3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm with many disposable URLs, suggesting a phishing or SEO spamming campaign. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://mn-lawfirm.com/box/userfiles/file/11977259580.pdf In PDF document text
    • http://bestbuyfromindia.com/userfiles/file/92916172293.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xakenokarofokoxosivig.pdfIn PDF document text
    • https://doitoutdoorz.com/file/WaseQlbZaR7KMxY4.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/86550121981.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/jexelefazesupetuf.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210902045226.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/44809356319.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/25596617947.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/kugofinulenemibareposovu.pdfIn PDF document text
    • https://fratellifurloni.it/file/nasepodonuvasixugododixor.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11523015845.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389420ea15f---97681916142.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/44330194263.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a4feb94ce3913827274504eb412f40c0/83012783636.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/98615384213.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/neveguduvekuligub.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/najigezisejipevibi.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/61373943359.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/misakotupaduditonoweguru.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/92020330914.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/tomumifedosiviwa.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612eb9a43886e.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/dakabotufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ultimate+stick+fight+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 24000 bytes
SHA-256: 5580e8bc4c9a2b2154831baee439dcda92ac7a554cfab076b7199b2110ffb317
font_01_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 10964 bytes
SHA-256: bf76303c80e752fbde6b9f1b22938e1fd2e07eb425f5d459e9e743c78bcb9083
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE7 16316 bytes
SHA-256: 240e91d3c93f322874c8ecf578a5ed642992a167f318b37a8fb03d157e744a92