Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d1e74c0c5554a5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 21:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 898f22a6084bed015f00c295e0875120 SHA-1: 97d184f85d882c6c1a636ae8426e1b41d2190bfb SHA-256: a5d1e74c0c5554a5d594bb4fedb19f1857fb6280f67c5656ce0d2d4d6f631ff3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious. It contains a high number of embedded URLs, many pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

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://dalnoboy.com/data/filestorage/upload/files/pifebonamigofiletotoduwo.pdf In PDF document text
    • http://tnslib.su/userfiles/files/tonazit.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/38731205002.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/64389363147.pdfIn PDF document text
    • http://zzquansu.cn/d/files/logelivunomuluxawewom.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/kagagexu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/39997186806.pdfIn PDF document text
    • http://iphysiology.ru/upload/lotetatigif.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/52571900679.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a85cf7b62ea3f64fe228aab45706a/69122059744.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/50014650744.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/46203528984.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/48384304116.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/16191812258.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/57774680896.pdfIn PDF document text
    • http://goref.ru/files/file/wakofuxitapad.pdfIn PDF document text
    • https://edex.co/userfiles/files/282992852.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/73712543058.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/45277684199.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f40188c4e---dowumodutapajatol.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/25801912496.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/migikuxajagetoveliwo.pdfIn PDF document text
    • http://htwy.com/upload/file/49072023441.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/waxukemovedejafosun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=xvive+u3+user+manualPDF 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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 10396 bytes
SHA-256: 99f59c16d12ff74fbca3ff4ea0bea1250b57c2a33dc88c04785574b726649c59
font_02_sfnt_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 17992 bytes
SHA-256: 551138d805e5da536f6d03b046216a7a079e46c85e5de608031ce0143a7a117d