Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb87aa9061c644c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 13:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7736fd9c5af0531a48245575e8339e16 SHA-1: f85d99bdd450e8ac0cab365c8c8a4c69162e59ed SHA-256: bdb87aa9061c644cc87396761d36b391354641e4d434a60f72d386a1efacfd5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=android+development+pdf PDF link annotation
    • http://luatsugiadinhviet.com/upload/ck/files/furabazogagefutogaga.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/goboguselulux.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/jukivixoxirejugekanelitep.pdfIn PDF document text
    • https://eetravel.net/file/4403037069.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/90962402277.pdfIn PDF document text
    • http://gibisch.org/files/files/zoxoxonisuma.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/fifomufefokejiniju.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/wilurimoxesaxuba.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/guwafomitixuri.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/totor.pdfIn PDF document text
    • https://mimpidia.com/contents/files/norepipukobata.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/69992225693.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zugoniwel.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/7131996834.pdfIn PDF document text
    • https://limsurdua.com/contents/files/tukuwaf.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/50168172184.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/29936239186.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/80492864628.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fanilapoxuwufejigibagit.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/71758497207.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/dimokomudiborexoli.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/wezuwegoxozopadikixape.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_off0000ae17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 10376 bytes
SHA-256: 995fab1eb6bf27beab31712d8750e9ded507b869ae7fb28dfc02735e46e781e1
font_02_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 16804 bytes
SHA-256: 44f8329d976a063ab2b12fdbb90b5f608bfe48616856de2d03c99bbbab402c03

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