Malicious PDF — malware analysis report

Static analysis result for SHA-256 1709c7187fb83f55…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 12:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5165c5122996bf5eca101d9e854637b SHA-1: 4ed5eeae03d436bc64bb4b927c3c0cc9533c69bc SHA-256: 1709c7187fb83f55aff539b41ceab24a1041fa7ceebf0a7df8deda754f5ed0d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=free+fire+10+mb+ka PDF link annotation
    • https://nnkcreations.com/userfiles/file/dimubotumofizopet.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/84636201515.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/7566648149.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/35329638349.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/bexorebul.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/46767251490.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/vavetikasazodu.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vudupez.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/rolefizukenakudasutupope.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68303576485.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gokinajun.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/12051961330.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/35916b28885cde84b4977052e2c18e04/74359876444.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/76928997194.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83179945309.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/41132100936.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/5093021332.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kozafakinorubiwowopawo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161396120ebd03---nerurojijoravizamijitekuz.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/57090741976.pdfIn PDF document text
    • http://tzsunup.com/upload/49820066769.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/rikefifizolopemezowu.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/34679294173.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/bebapimo.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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 17656 bytes
SHA-256: 4b82c56ceaac5560cc053b7d1e2d97096a320d9fc9e3be63b0d80543b87c412c
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 10220 bytes
SHA-256: f51cf981fd0610ad19dc68a3161f11a0a6626a007f8d0ad1dee1d9e9a44d60a6