Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af576067f7cfbd0…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 09:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c0c4ba764f4a83368bd34672b0f8c04 SHA-1: 97513c0adcfca41e4a774f7e132d7b15a5bc84c5 SHA-256: 5af576067f7cfbd0af85bd09f3842171f8dccfdcf4349b904532f24f706ff90a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The authoring application 'wkhtmltopdf' is unusual for a malicious PDF, but the heuristic firings strongly indicate malicious intent through URL distribution.

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://inwebjor.ru/uplcv?utm_term=hnc+sport+live+tv+for+android PDF link annotation
    • http://rnralpha.cz/res/file/nuberalupukewiku.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/52913934232.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/22124405652.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/ronotatiwivizad.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_E27F2B196DE4FB89.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/57099077143.pdfIn PDF document text
    • http://coumert.com/images/file/gibab.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/56518384557.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/29556964602.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/dulawupokalepab.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/40331862724.pdfIn PDF document text
    • https://breedlife.com/upload/files/88484648695.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/50374792251.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kitunukexojolajogobomokaj.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/lozono.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/kevex.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/riboxazetisumojo.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/dokos.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/53a63da6abea3e5132055aa38ddebb91/16283369873.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/95633026680.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/88276698070.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/80888060071.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/vojawawazigirinibija.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/24129661950.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_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 16308 bytes
SHA-256: da6f8c0859ddda013ccb75b2cdf596546a1a443476a8696adc140d15f4f825cb
font_01_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 10668 bytes
SHA-256: fb79200b91a89cb13dfa99837cdac19298cdf47ebdfc55a2d942524378bb4d6a

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