Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc0b4046d48b030…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 17:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b2d9819d9eecec5e347f0e346479451 SHA-1: cb371063975dcbcd10b7ac5411c64dbd3bd6baff SHA-256: fbc0b4046d48b030ed2f34457d2fc0514dd58eb5b3ce02a14bba0db6de7c5014
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous URLs suggest the document functions as a link farm, directing users to potentially malicious or phishing sites. The document body was unreadable, but the overall structure and URL patterns point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=what+does+nfc+on+my+phone+stand+for PDF link annotation
    • http://siltherm.com/ckfinder/userfiles/files/90632604954.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-13/20210913011705439920.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/satedavojaxidob.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/jajinesisolalopelujel.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/64448660440.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/bapalukinukasuji.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/falatujilev.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/55950000553.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/rabatalodanefa.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/luwilelakalakati.pdfIn PDF document text
    • http://runhouchem.com/upload/files/92158328485.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/78775078141.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/penow.pdfIn PDF document text
    • https://phuquiland.com/upload/files/lewavopafibuvomejevigumo.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasobumalosomolekami.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090304175073499.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/709616447.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421070bf0b---saxivuwexivixufazapemider.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/tawejabazuwalogigu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901140627583042.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/zarowu.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/sulipibiruj.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/86505066734.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/munalupag.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/15021171294.pdfIn PDF document text
    • 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_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 10852 bytes
SHA-256: 6e395d9acacb292644a99a0ad934a25f4ded16b85d83fa4aa152a1d934cc573b
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 17160 bytes
SHA-256: 702814f8cc6f0152025d5d1dd191997a62c93b5e70d58af11de191a379bbd1cc
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1