Malicious PDF — malware analysis report

Static analysis result for SHA-256 127bced31cd6a2ac…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 00:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae00e2f7b751e36022d6e36b4d77f741 SHA-1: e803e1a0f3ec7c8b3d2ce3b8a1f0fbde0484f19c SHA-256: 127bced31cd6a2ac7a6c7435b6c5e66dd49b2d86adf43e725a24627b256f1cc7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=android+gingerbread+apk PDF link annotation
    • http://abwnickersonplaza.com/uploads/files/74694548438.pdfIn PDF document text
    • https://agrando.cz/files/file/55644578264.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/76750581543.pdfIn PDF document text
    • http://freeorden.com/media/file/jekenudanipi.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/89904666040.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tajomajezuwifig.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/24530890952.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/42608168550.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fawopebitegesugitejip.pdfIn PDF document text
    • http://bwc.lt/i/16763016868.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/xudonopin.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nutet.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/10967212208.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/safoguludikopipim.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109071652295794.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/mulunozedemopewiwenamaf.pdfIn PDF document text
    • http://coumert.com/images/file/dejifofonegipofedexiwa.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/58265577734.pdfIn PDF document text
    • http://4bx.pl/public/file/63813941402.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/41131678368.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/70561715519.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9068a78fdc223d36df253e199c8149e0/nefokejisenirawe.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/82356480281.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/93128544322.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da426b9ce---74023796618.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/81427988298.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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 10468 bytes
SHA-256: b1cbe70fbf634f9e6618bfcd402cb175007157d8b8f61e62742ad11c8cdc9a56
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 18704 bytes
SHA-256: 7f19c07bd1a2aa386fa3e0c989e1d2f2ebaa38d7a9f53fe2bcbf5ddf64b6ddfb
font_02_sfnt_off0001473b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1