Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd7c28bdd71e531…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 13:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82ff3f3117a61d4044c06b07cc7a3737 SHA-1: 97ef847009e56a5ceb9afd3d686b850a8b82e31f SHA-256: 5fd7c28bdd71e531ef03744686dfe0e66b03c5376493470765d0597582c24ef3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this purpose, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=how+to+recover+imac+password PDF link annotation
    • http://newabel.com/ckfinder/userfiles/files/kokogaxonuburoxegunonam.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sosikowiwikewujoveduwatok.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/tunajapule.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/nititi.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121151172900.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/47543070698.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/jalisokukesu.pdfIn PDF document text
    • http://cncsprings.com/d/files/wubemotidusaxisidukejidex.pdfIn PDF document text
    • https://doitoutdoorz.com/file/oL2FzXhxWnl7RxeX.pdfIn PDF document text
    • http://myesen.life/userfiles/file/83548533209.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137776d33a99---3507080089.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/19136984765.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/42968987071.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/muzilaxodonugudonez.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/57060332821.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c4cd23303---pojosaroriwamuzij.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/putase.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/lutijenebuja.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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 16988 bytes
SHA-256: ac08389758279f0d8be016602b71220013587f36d25ec6a2ffb6fbae56333241
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10668 bytes
SHA-256: 620fe4670784e7f4415e8e8adf6e08584d55b4a5ed44f7eb8d829c2a22efae67

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