Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc55081c64d9597c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 07:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d939b521b83158118514593d09fcc222 SHA-1: 9d94c93eec0838c9eb491acc204cbcd27b08038c SHA-256: fc55081c64d9597c8c7976329a1340d367b1c13c55ea6d0427a2b8e86ff8342c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, suggesting an attempt to distribute malicious content or conduct phishing. 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://typeone.com.my/ckfinder/userfiles/files/33567516126.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/83802383137.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/jupowetusururumewenowa.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/rupiwetulipezeteno.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021919133746.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/fafil.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210908_004909.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_21_12_16_39_7860.pdfIn PDF document text
    • http://ccshecea.org/upload/files/1530736448.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/5231132519.pdfIn PDF document text
    • http://retailcop.ca/files/buzuxixawokorufimil.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/2076264776.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/27006886719.pdfIn PDF document text
    • https://dcimx.com/files/50118400245.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/64882120312.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/xaxukubidotikodivo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90811519958.pdfIn PDF document text
    • https://fratellifurloni.it/file/40798404735.pdfIn PDF document text
    • http://zgic.ru/!upload/files/vipilejenu.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/18842693025.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/25109947411.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2n6ob4ve8ialldft0bj6395266/runomumipi.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/4771067583.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6439210534.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/genokujutafufupajire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=top+10+most+populous+countriesPDF 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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 10608 bytes
SHA-256: ad2cc358d04a9cbf93c31c447a2421f669c6c4d916630c3211e530603e57fc41
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 15700 bytes
SHA-256: 49fdf19644abeea96ca374801042547a5ffdeab2f3e2b97b8cab098b0ed7f7a4