Malicious PDF — malware analysis report

Static analysis result for SHA-256 baecf97e11367bf1…

MALICIOUS

PDF

107.2 KB Created: 2021-09-09 17:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da1b5dde43f4baed4adadf1e15d5aa23 SHA-1: 1eb635ddfdcc46b6b1add5acc1c9b0e56d67f1e5 SHA-256: baecf97e11367bf13ad9d20fe981cad126d7a7749fa997b79f15072409fc8ed3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous external URIs, suggesting it is intended to redirect users to malicious websites. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://coretry.ru/uplcv?utm_term=javascript+handbook+pdf PDF link annotation
    • https://cambodiadriverservice.com/userfiles/file/metifakenofitef.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/2486493247.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/95471324219.pdfIn PDF document text
    • https://taperagi.com/contents/files/bexodon.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/futosudazeb.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/11546413606.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905113741.pdfIn PDF document text
    • http://tdbm.vn/upload/files/xalav.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/nalapelomasudobixafuvipev.pdfIn PDF document text
    • http://bndweb.nl/upload/files/69920414286.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/40011402486.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/sogonikutabulina.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pavovem.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916689eaa2---fapopixivetaxowogikilu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/69272022879.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/42471480553.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/loxikozevovajijewafujeze.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/zuzopofesiragev.pdfIn PDF document text
    • http://chongros.com/userData/board/file/1578993126.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/29570218194.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/99930176480.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090501464673499.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/40494797681.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901190108587142.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_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15305 10828 bytes
SHA-256: 1e272cae6bd6cdcb5792a9a225c8c4da005199f86c5e44fb026fca72c6e06c85
font_02_sfnt_off00016bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB5 19580 bytes
SHA-256: 5cd3c97da71c2f3835cdc1295427934d2f56b1d309a34c73f43c02bb71c80f36