Malicious PDF — malware analysis report

Static analysis result for SHA-256 8297c0d610c302d9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 04:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cee283ae32543fe0015c4a13da863e0 SHA-1: 88677b521a3716198755afc9f6edb3f1246992b3 SHA-256: 8297c0d610c302d9e9ae681b19d6ec44dc8ddf5601a360087d70011ad40892c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or spread links across many domains. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://optimustelecoms.com/ckfinder/userfiles/files/fuvipurunutukoxur.pdf In PDF document text
    • http://autoneza.cz/UserFiles/File/tezarinope.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/39115261403.pdfIn PDF document text
    • https://bliznacite.com/files/gexepugavofegexiwute.pdfIn PDF document text
    • http://ladna.pl/user_images/file/77247591676.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/22836220968.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/piwoxenudadekudixeku.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/76814369855.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/10810970253.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/xizevemom.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/90974794488.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xaxodexu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090402311273499.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909195148.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bogukirim.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nidetozoposiv.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/27503709577.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/matip.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/xajijufidewup.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/95577094872.pdfIn PDF document text
    • https://greenways.at/userfiles/file/69552338458.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/totupasavusa.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/59675995624.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/jidurijaxubafitasetakava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+delete+facebook+posts+on+androidPDF 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_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 10920 bytes
SHA-256: 2de30e3acb4d05178a5472336a32d4dc316fcf1b341c831677c25b2cdf80ad5c
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 17084 bytes
SHA-256: b7812435ce0765338230a1cf6860e22ab6586775c071107febd430a1b87dc1cc

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