Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c95e1a316dd3dba…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 04:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cd1315390c83907549f2943b42d5a05 SHA-1: 529cfaedda799e4f3f2d42a5c0993fcd67543611 SHA-256: 9c95e1a316dd3dba00ef58dda15f695cef4afa51c802d0488c00a08c0d11a326
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/dadumatesinof.pdf In PDF document text
    • http://cokhiminhhien.com/media/ftp/file/64045599100.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5feede11---totijanewupukosunonudamo.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lopiva.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210906_E41CC91664DFF0FF.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/jasabenojitelebexuret.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k7tj6pjkosn6piofr93jdduar2/fatenepinegavagutil.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/gopejowezetosu.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/94225290761.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/godeteruxixigidi.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/4151803591.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/bozifox.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/23288638207.pdfIn PDF document text
    • http://chenruichem.com/upload/files/98484076969.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/tababipivegebusefuluwoza.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/30417877241.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/91901033124.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wunuvokewebosejelukazo.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/36422164747.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/57236797951.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nimotixuzulozisepegusi.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/37080618892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=extract+images+from+apkPDF 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 17428 bytes
SHA-256: 7ad79bc4d7d780b93b55419f6cc3fedde60f6c626863d39398961e0eb5e1ae87
font_01_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 10848 bytes
SHA-256: dad502bc983d3e01351228da2943de757cbd937d7e14d1d3e21600c0da9103d9
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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