Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde36af2cf590217…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 06:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d007ccf4ab73faffa3441f7b5a01f1c5 SHA-1: 09571cb9b2305218e6fc69d88ffaa039fd82eb5e SHA-256: bde36af2cf590217c92e74dd3048d00987db6e31757029d6c8e5ceb379a4db91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=how+to+get+free+minecoin PDF link annotation
    • http://holidayservicemarsala.it/userfiles/files/68722720529.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zalane.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905021507996896.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/ruduremubidigisebe.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vfscmsfonpek709t8g72fitlqq/zalivomafitemefafilebiki.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/87385152555.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/93584904056.pdfIn PDF document text
    • https://ahha.az/userfiles/file/38810045623.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219765578147.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/takuluvegilanezavon.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99304481577.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/lepep.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/lokam.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/98670658026.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/94246528526.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/dajofuludowerunap.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/11441496964.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/zubenanaxukan.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/24702833645.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/vidopitaka.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/61449671191.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pepebuxilosos.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/nobixinorelemefusi.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/fagaxobonumop.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/dupalowetuwewuvimisas.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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 10380 bytes
SHA-256: ceff48530ad2c00a22dd71ce272959e278293ea9d9e56d92fa8791941aa97d20
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 19552 bytes
SHA-256: 852371450f842db48d775e118896f0f0bf58b5409a24df7703e6870b97e4d6a1
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1