Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9a15268f14fa45…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 13:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9435b5a63670780214fc7e78637735b7 SHA-1: 2742d0fc15ed41224382109b39ed24487819aff7 SHA-256: ab9a15268f14fa451e2b5890ef624ebdec816920d897085e0ba2f4bb0588be67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent, likely for phishing or distributing further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://allytemp.ru/uplcv?utm_term=vidmate+4g+app PDF link annotation
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_234900.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/36558046783.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/jemibupusegamekovu.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/pijodikibuwimus.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/rasukem.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/xulanufisimovun.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/99669098447.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46035600509.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/66962822560.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/90459909422.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/sarajejukebu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/lisizavoxivilojisigel.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/kezesenapakaropuza.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/3631317013.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/18189630600.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/12807846938.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/23053782514.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tenirekiwogul.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613760c7e7362---23214541883.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/64290801164.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/duwajoxivisoramalonutomu.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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 18236 bytes
SHA-256: a15853971ec806019e6bdb9bc99cd30f6b684d9c391128dd641ddc203dd2551d
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 10244 bytes
SHA-256: 249670fc7c18328b39d7370699b70e4b5ec0558b98c4db771a0dff3f7829098b
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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