Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e9d6dd3f8fa51f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 14:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f18042d3445232408179e002dd24b1a7 SHA-1: d881e1cbc6e12f9ea7e5020d345dfbdee5c0f377 SHA-256: b4e9d6dd3f8fa51f861866904f02fc47f45785b23c3d2e9cb46994789ba43ec6
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the attack pattern.

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://deltarealestate-eg.com/userfiles/file/79145423553.pdf In PDF document text
    • http://chinalabware.net/d/files/69008731818.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kulosomexelewume.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/49576106895.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/67394361054.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/jejaboxeve.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630990608.pdfIn PDF document text
    • http://adriennemason.com/assets/files/gukokevojunomozufedek.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/lifofoj.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nozonet.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/69085576889.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613554a250edd---46598393829.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/rorovunal.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/zusivusudavagezomiwinudos.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/lotapirubovoxujalafu.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/rivuzaxotupiluposetexa.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/semijimuruxaf.pdfIn PDF document text
    • http://e-sheremet.com/img/xufutavijirabimoj.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324172d23b9---14426934089.pdfIn PDF document text
    • https://tebra.si/userfiles/file/53078573360.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/rusifarijizupo.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/xuduwuk.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/49757172123.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/sapixafubi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/vaxagubumokixujajef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+weather+apps+for+firestickPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10584 bytes
SHA-256: 002d31e2ef712f99bb6caf1b9e9628a75b9b9f60d8e456409500546520202ccc
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 18484 bytes
SHA-256: 6c7b68ff2aadbf570d6724c914ea6559b30c36d1a2ae35a9cce621eecd755689
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.