Malicious PDF — malware analysis report

Static analysis result for SHA-256 7132102f2d71401c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 02:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2c10bc01711acb933e84e05accf7714 SHA-1: 655d94aa667873ba4659375fe6187d081e344bf6 SHA-256: 7132102f2d71401ca95c053769e3c0d59f1e9a22abda0dd9cf830c057122635a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. This behavior, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://doremimarlikinsaat.com/userfiles/file/44634415450.pdf In PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/xurudajosebiwit.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/pamoloxabufolixiwaketuvu.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/viwozegomojusukarose.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/ninisem.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/suneg.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/jefikamomigojesawi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/50179432373.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/90641604425.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/dokaxa.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/96349888661.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/zexajuzopaluzexelul.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/2758906216.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/21290346299.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/36689199028.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/8534555229.pdfIn PDF document text
    • http://annabarons.lv/files/files/11085896897.pdfIn PDF document text
    • http://medica-brno.com/files/30100288862.pdfIn PDF document text
    • http://budropol.de/Upload/file/81852672361.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135c925bc520---45306044891.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/27343841069.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/sezogewotezejoma.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/rutiraros.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/41529771409.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/82525649266.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/96683322287.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wizavijaziluzupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=itextsharp+generate+pdf+c%23PDF 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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 10696 bytes
SHA-256: 61ecfd0abef3462d453cbb70593c5bb9418652546f0837afc838d8ba3b3ad317
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 19184 bytes
SHA-256: ae15f881551593e55ef127d1bca68279b3bffa778eb03498b556f4cf861fe056