Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d62259df011a36…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 10:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6dc182d591912c8c4b07a829c562d53 SHA-1: f4465a1dbf5848ca1ba570b62d22bbfc47d7a066 SHA-256: 48d62259df011a3693bb7f3c1cc4af6b44a73b00a44badc280954a06ab4a8f82
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which appear to be disposable or low-reputation. The heuristic 'PDF_RANDOM_URL_LINK' specifically flags a link to 'http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/ximatejud.pdf', indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://duel.pl/userfiles/file/66164712118.pdf In PDF document text
    • http://ibb-online.ru/f/file/lijonanonozegigajukitiwif.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/ximatejud.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/57922795684.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xujuboloko.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fuleloro.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/ferebefigaxix.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1f322d2f2110012fe076901bf18334e8/pubagemiz.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/biguwiporajewunigutor.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/57490239194.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/tixifoketuwagesopox.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/80462347982.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/53013857624.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137b8e0cbd---66209959457.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16139c147e9d24---86775541071.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/dibujubikapuxiparulekire.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fofodenavabuwimijul.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/vopiju.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/65251400355.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/40933731388.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/34262940572.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/zipemolutudagiwotekafusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hunger+games+synopsisPDF 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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 10656 bytes
SHA-256: 95e64606e322f886df8a381757511f15046d341f431a01dd56bb80b6c6483ebd
font_02_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 16984 bytes
SHA-256: 90e7f3a184800c0aff3b97b4d999c9d1aeada8e88cc71ba77837734544e5a264