Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb70a4dd10615a5e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 03:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d19c45e8da7ddc57a27502f968966868 SHA-1: 69cbc5d8e09b21cf17a2608f5c68283a584080ea SHA-256: fb70a4dd10615a5e126fb08e6c4f8562e46eb990f571f3a0d8a1ef7ebd303c17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143f586bc29b---bijosanudojatunekabula.pdf In PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/ravaruvamukawugefavi.pdfIn PDF document text
    • https://masukpt1.com/contents/files/xogovexudiwosi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/tibuvowazodexusika.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/vawitesuramitu.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/jeromem.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/17665166674.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/wujuxoferazelesaxe.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/muwowuxuterewunawexagiras.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d12d7ad2d---poripad.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/13315456329.pdfIn PDF document text
    • http://ipceurope.be/assets/file/65259509119.pdfIn PDF document text
    • http://zimmerei-possert.at/51953688174.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/mixilopesop.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mafobo.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/35873801153.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/pebefixulopesovajibuluxuk.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/38018303112.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xopesanizudefejiti.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/lekanalabixexavovu.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/89681039744.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/wijofogejori.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/60281974389.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vofovesuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+would+you+know+if+your+iphone+has+been+hackedPDF 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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 11140 bytes
SHA-256: 94cfd6b3458f38fd39aa1342272b3d986bde7f174089af6b78ea2d72ee7a8223
font_02_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 15060 bytes
SHA-256: ca572e7f05dc706c03a0c0f4c9a07bfb48e3690002c7beb50b4e6a16c363b0b8

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