Malicious PDF — malware analysis report

Static analysis result for SHA-256 4875df4e1558fb13…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 15:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d90ec54fb89b07c2c6bbe1a5d0abe2a4 SHA-1: 06f6fe2d6acd4caa724850fae92eac55e7e4a922 SHA-256: 4875df4e1558fb1376f6b7b16054f4614b3f962ca3275d27de1e94a1c0295bfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://vip-cond.ru/userfiles/file/noxolizobifonelipulepivu.pdf In PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/21773286617.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/45341080502.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/revutozuvi.pdfIn PDF document text
    • http://etre-belle.su/images/file/79151509572.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/88861455621.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/35564083066.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/vokukonoripovikefi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613503116f6db---21550355648.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/82797451191.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/7149992347.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wowenuzexirawoxa.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346348a95e1---5813013926.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/vakijobonemenawasofu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/gilib.pdfIn PDF document text
    • https://kaimano.it/file/zomijerexurekasinuj.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/5106835431.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/39226379784.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/99217025903.pdfIn PDF document text
    • http://xenangheli.vn/public/files/78510892020.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nagatukipamojar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=setting+ppsspp+goldPDF 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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 18484 bytes
SHA-256: fee9ddd488eb8a48f30db95515dd576d20cfd65df9377bf23504a047a42182a2
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10380 bytes
SHA-256: d3996db6eeabd69d4b7f4dc838ddc964db64bbda3d4b86a06728f5f5acf3a344