Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc589f2ce0874f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 20:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a0026ddb52d72b1200e285489861d51 SHA-1: 007a536e23951160f2b75605cf43bd945c4ce16e SHA-256: 38cc589f2ce0874f7818956a18b55d012ac3d4b4001d43c5e755d1b492b7946c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV detection further confirms this, identifying it as a phishing trojan. The file likely serves as a lure to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ulv-fogger.ru/d/files/kejejejakixexita.pdf In PDF document text
    • https://vietrocknet.org/app/webroot/img/files/jibeledosepe.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/pepexituduwimebanaposi.pdfIn PDF document text
    • http://keacg.com/upload/files/23013127531.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/pabajapamobejumevafaperen.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/femebifameforivupavi.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/39105041471.pdfIn PDF document text
    • https://aspirans.com/files/file/bifeninisax.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/lulip.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nesefapikut.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/pizolalokadeva.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/tafodapamazubadolases.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbb459f81---nevewenubabekedosan.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7d977ae25e6325de52082bf2d50c295/lagurilenapokuxuwadabekop.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/wugugunebexuf.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/50535223515.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/59256139396.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/56301891520.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/vuwetosaruzemanipebuwefa.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/kikulidixilakureruni.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/xanixaxofatixijetitez.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/81589995742.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/ruven.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/dinogepu.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/93460854849.pdfIn PDF document text
    • http://benetalent.com/upload/files/33773302452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adrama+tv+box+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 18696 bytes
SHA-256: 67be56d86b2dfcde53f2f01f85ce37e5267ef90af788b233394f24827b36aef6
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 10392 bytes
SHA-256: db33090c0dedbd24c710a1a2b2bc8407e8af0310d430480cc8fd74a2d7491d02