Malicious PDF — malware analysis report

Static analysis result for SHA-256 849dda174895c858…

MALICIOUS

PDF

87.6 KB Created: 2021-10-04 14:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8973cb208ef397556045b1f37fe8420b SHA-1: b3c41d73169f1177ac52f257e4d369c28ef63b0f SHA-256: 849dda174895c858270febcd751763134464b759746103c28f2ede954a086ba2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with many distinct hosts and UTM parameters, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the embedded URLs point to potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://packamate.com/userfiles/149117954.pdf In PDF document text
    • http://kmjmt.com/news/upload/file/211001121802722971y7s05u.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/76851339281.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e630e89a37---98836368895.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/53177490055.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/godonanoniluwifitupolile.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/palerelilidif.pdfIn PDF document text
    • http://vodnik48.ru/content/file/dazaza.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/98229615798.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/newaku.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/43584090486.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16153bb1aa211f---gatezufi.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/vubokizogefubik.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fogavajiru.pdfIn PDF document text
    • https://penzion-palice.cz/content/zasizawoteroxota.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/lixesizeximetarudegexaze.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/86698483803.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/rilaluzarijewujabe.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/55056367603.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/tupowojuligikuxi.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/piwixexa.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zekufeluxagolasowurufem.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/motegimepitefeji.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/suredezajib.pdfIn PDF document text
    • https://network-italia.com/file/32574714752.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/rudolesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sweet+sour+spare+ribs+with+daikonPDF 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10936 bytes
SHA-256: 6a13efa5dba6056ecd8080f2e21f2f14805442ce549adc51b4049656cf059a3f
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 20640 bytes
SHA-256: 3f5a8fd0471da9af41ad72dfde8b54cadc7c003f495938339a3f268941c55eb3