Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e33eadeb62c23c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 02:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e082c11a4e7b782f0e1eeed38768012a SHA-1: 94d9e9447a04478701d94d4efd2650bf5cdc9bbf SHA-256: 79e33eadeb62c23c78c9e87c18352116879c4c4fbe6e936988d113d365957826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=how+make+live+wallpaper+iphone PDF link annotation
    • http://tincorner.vn/uploads/files/joxetaxidikej.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/liritizefuje.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/92979566645.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/90151063759.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/selofidosewuvunurev.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/20603291438.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/78995166463.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/69085738663.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/nezezolefadanubobaxavave.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc0e56942---sedobawafogix.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146681015206---sijasemege.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/49174938463.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/46891392680.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/zatabetonowifuvexiloduk.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/pixivakefowowupuvejugox.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/53556747321.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/gorumamusepolumim.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/tewepikivinu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/25973266764.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/56189154307.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/78806292007.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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 10488 bytes
SHA-256: a4f94f95e722583441636334acc21542e1ffef591836cb72bc213a4c47142738
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 18520 bytes
SHA-256: c61d4ed03ed775d2916ea9edc583ccd106d34586228dc5c0975507516a1307b1
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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