Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9814721eb0b442…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 20:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1f149741d2cdbf4ec4d75b7bf6b43be SHA-1: 94a545646f5c518279e62a8704055222be440807 SHA-256: da9814721eb0b4420de530de7edf78e602c9fc11827f5650c4ef88edc20ac548
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://uran-berlin.com/userfiles/file/lunada.pdf In PDF document text
    • http://lnyuanzong.com/uploads/files/20210915155941.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/kukulexumamo.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/82932753756.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/80457061674.pdfIn PDF document text
    • https://salonrewards.ca/images/file/86422773260.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gopinalivugov.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/ruwulezideji.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903101653.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/94145787131.pdfIn PDF document text
    • https://aksusu.com/upload/files/rupuzexalake.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/jobajezexijebiwonup.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/laxuj.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/30883159755.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/mabatapisirudu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396c4b91f95---vimir.pdfIn PDF document text
    • https://casaalu.com/luutru/files/riwekaxugonudufejuso.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/xamorurom.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/77253015363.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/92195540483.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c5e0f459fc51517d4eff35748c317f1c/fugatiwimoxapagine.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/damat.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/73569843402.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/81021713298.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/71335613304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=c%2B%2B+interview+questions+and+answers+pdfPDF 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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 17680 bytes
SHA-256: 0ceaed4d72dfc82ddf6ef7331beaecc35af6c17e99134ac784ac3119e63c93c9
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10876 bytes
SHA-256: b10df95ded167f7ece35fd9a560253e44309b2636802ee6f58f7633b21cc9135
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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