Malicious PDF — malware analysis report

Static analysis result for SHA-256 20eb94b21458f3fe…

MALICIOUS

PDF

90.8 KB Created: 2021-09-09 05:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a65a11c799c064f509d8aba63ce92c51 SHA-1: 6a2e9fa684a91856ffa6070afa7b041f06b5303d SHA-256: 20eb94b21458f3fe4ab965399709ab8ebda71b4087ff4eafdf1a6b0c250d9473
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. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, likely to evade detection or for SEO manipulation. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137695011ad5---gotuwuwewimovaf.pdf In PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/juzufurutodozaxan.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/99917665806.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/vijesamijoxikilikuzat.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/ligitorabipofone.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/babixajezavatogu.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/91368358833.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021931110142473.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/87496840163.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/jovigorimunemepalakukezes.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/48314687085.pdfIn PDF document text
    • http://hingliltd.com/userfiles/sajagiviginesikezerir.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/32791397871.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109090051073424.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/rosuf.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/vafubepazol.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vitaxu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210905231325.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/96418576474.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zurudanaxekidi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e9a069feed738e8d60c2ae38cde3a4b7/foxedululegirotak.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/53622006202.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/42619048687.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/16696682444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+game+sepak+bola+offline+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 10964 bytes
SHA-256: 883defb7c7192055ae7c392a41d44b358ad829328567218651d668806ec8b256
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 17676 bytes
SHA-256: cddf550bb6f39e1995d359056b04718f72dd61cccc0e2a2896646d17bcb5a494
font_03_sfnt_off00014270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14270 17636 bytes
SHA-256: a361e1bc4834d2598585197d613562f9233bda8b5dd8e1e68c7a7712ac7a1acc