Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ba317af9976608…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 02:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bac6523df83178077fa9c7bdcffbc626 SHA-1: b00e8592941d25364ba91b9aa6c9162ad860f863 SHA-256: 88ba317af9976608307ce6ab5439d8c3701ec1554f819600c9427d14eb2625ad
126 Risk Score

Malware Insights

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

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, with 30 links to 23 distinct hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. The embedded URLs point to various domains, many of which are likely part of this link farm, designed to redirect users to potentially harmful content.

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 http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49465270020.pdf In PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/5763240663.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041203229976.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/40661868375.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305193386756.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/23337397186.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/jolawirebodezomuvenorak.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/20879213178.pdfIn PDF document text
    • http://ministerium.pt/files/zukukosasuribeb.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/woludor.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/39181197287.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/gumema.pdfIn PDF document text
    • https://esvigo.com/upload/files/89720561970.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78014496997.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jikezulililanebilabega.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/53747341185.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mulikubulafodumepap.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/sonifuf.pdfIn PDF document text
    • http://talesma.com/E/file/90041796569.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/18174099653.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/20574259048.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuzuzutolepuzigeritax.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/pateposuwudazow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+tickets+and+gems+for+episodePDF 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_off0000b097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 14752 bytes
SHA-256: 8bb67bf9ffaab4bbe45ba18bbbaf849e17873fe1fae251baa87ac1ca48408ba9
font_01_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10988 bytes
SHA-256: dd9418ce3d3c18deb9d521816d608b4ff59d865a8e31c35df9497f2000b34ce3
font_02_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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