Malicious PDF — malware analysis report

Static analysis result for SHA-256 60183e3f1802e655…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 21:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7c8ae925317f928cc2b10d1d5b63dfc SHA-1: 7ba53970d1aa17c69d72678e5e9c2849b8c24361 SHA-256: 60183e3f1802e655177c25f786dbea7aff4d569db58195b69d06c3f636df8b10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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.
  • 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://mastervgtour.by/var/upload/file/letesowumogomo.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kiwipedejejibotakigifusip.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vekizijomitedi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a717582e6---71733583294.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/34247534441.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/nimasunalifavagunamo.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/11905626274.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210908_133525.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/92190635426.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/jatijalut.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109172100462948.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/62964065761338eb5213ec.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/72495038984.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/lumofunemabudavoku.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/zinevizomagosulikerozile.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092800141373499.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/53812195124.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/44151448321.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/sudidukisefinujamij.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465c3e264eb---7831843810.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/80553629229.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/garejenojuvolowatevog.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sipabitadivosojeki.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/45299695384.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75901304898.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/90260172796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=smart+phonics+new+edition+pdf+free+downloadPDF 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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 11044 bytes
SHA-256: 36961038602c799787a0f3b6f6f5573d9b54412b19a725632eecd592d2d2c3dc
font_01_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 15104 bytes
SHA-256: 81aebcf42e7029165b2982e38103862fbc7a779bed71bb22de4b7a08c6143064
font_02_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1