Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab65b3aa8724a80d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-12 20:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 207e7529b7efba5385e95668822b7ac6 SHA-1: 8e969112ccee346f3d4a92b3a2392bcceb948249 SHA-256: ab65b3aa8724a80d0bbec5e2accf53d54fc7a6edb3ee8c296a6c1412501527d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the PDF is designed to redirect users to malicious sites.

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://pkpneu.cz/userfiles/file/jepirofi.pdf In PDF document text
    • https://datatech-int.com/userfiles/file/xifenovabo.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/lupadubevagipiz.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/50725814776.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/11630234526.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/zaxuwusubasekevavop.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/tuxiju.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/79110224155.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613895068f30b---41536108477.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/buzoxivapet.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/gefabekejudijevuwag.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/ruruzog.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/suradidazewovavokusemat.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/pozotixus.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210904051434_hrmpce.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lefedomelajuxelumex.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902123345175007.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f93d330e8---25474614637.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wulesumipesebop.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/18694889484.pdfIn PDF document text
    • http://decorstore.eu/upload/file/lojuronokekagadodowukawut.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/57446069720.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/26983467262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+emerald+version+zip+file+downloadPDF 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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 10864 bytes
SHA-256: e556e5aeba1f3e7f160e1a30323554f854599db090defceed976cd0318e63b7d
font_02_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 15564 bytes
SHA-256: f09b1688dafea669c2431c9283ab7b5acfef7c47c96b7346b436b95e155bd88b

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