Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d37d9b15d0302fe…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 19:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: daf4f3deae364717361f0651b3170e73 SHA-1: 2803a13422be1ae897906712725e138a318236f4 SHA-256: 3d37d9b15d0302febbcc8d7d57851dae62179339e0ce5362e61f4a044490046e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=free+games+for+iphone+8', are designed to redirect users to potentially harmful sites. The document's structure and numerous external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=free+games+for+iphone+8 PDF link annotation
    • http://tainghe.vn/userfiles/file/xilinudi.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/41959047810.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jojarupu.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/23817742758.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/zatelezolebosogesinip.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/44895113845.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/xejejomakukexivuponugo.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/lotavupoduputupejoxo.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/67205290238.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/bosisonanezaxunejutipa.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://hahapediatric.com/uploads/files/202109110218373667.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/86648098393.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sulorewewajazegugixixib.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/9209882268.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84022239340.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109130652045290.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/40257433087.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/75223619319.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/nikufixulufusorasi.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/jireborinigiziliwesukamog.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/mikud.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/13206066924.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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 16996 bytes
SHA-256: ad7a1c0c38577db4b3efc0e1eb9277b4fbb97a50fb874846e624d5513c54f15e
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10848 bytes
SHA-256: 9fc3c25022da2d144c2919094ac7709a044ee9b30a8ab889ee0ef8d4faa15169

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