Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96e034807d16f5c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 16:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c121a1b391a772509fef43caf4fb3925 SHA-1: bfe10ab55ea20e214e3d3d72843e688b1ff40a56 SHA-256: f96e034807d16f5ca51548eafae6e041cd801dd42554f83e582fc290688e9358
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on low-reputation hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=samp+download+android PDF link annotation
    • http://thietbiantoanttk.com/uploads/files/55347204933.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/89541398334.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/69625865905.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/folukebib.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/gididomegifetetusizat.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/2064716498.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/norijekijevujumox.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/45496039271.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/fibefotubodenivemiri.pdfIn PDF document text
    • https://banghenails.com/upload/file/zipogavexosuluselav.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/miroguwejuvexuxovibufipob.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/70589451345.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/90863181555.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137983abbfbb---39098055470.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/lupotevapowavesarekiri.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10178414579.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/89892510520.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/97094078224.pdfIn PDF document text
    • https://msiutilities.net/documents/sawotexotid.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/83625395880.pdfIn PDF document text
    • http://aven.su/userfiles/file/62426743173.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/burudijelu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/60661445648.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 10316 bytes
SHA-256: b54e533c32be91aca111659fea78f5d86c654f951fcc950f3513e545f77c0e92
font_01_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 20552 bytes
SHA-256: 8f6c63d6af8ec93a468135fd25bda6fb0d9fdf0c7e654717c93b3fcc74f7ea8d

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