Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dc6dea58da42ce…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 08:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 589485232b2c5e0853f97567c8da65a5 SHA-1: ad728c865cbce7151d9b566a478dff032bf89150 SHA-256: b9dc6dea58da42cebf48d8bfe2b4989dfd424ef05a833621c7ee90b7a2a772e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://irlanc.ru/uplcv?utm_term=download+game+pou+apk PDF link annotation
    • http://gsprojekt.eu/userfiles/files/59857791255.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/66944939142.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/poropakepekulogazesax.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fefad.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jorenupadagagevex.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/forulixaximepuxuman.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303b2111025---91885242856.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/8387955175.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/kunazegeri.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/13254332594.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/kiwapisejobijirilunenek.pdfIn PDF document text
    • http://fitviewer.biz/files/file/paxofajebolefiloz.pdfIn PDF document text
    • http://geasit.it/userfiles/files/kijaf.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/11283398063.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/77942779328.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/26060197844.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/sifetevurujakujifilodete.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/97154606104.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/6751031721.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/70836128074.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136679537b99---viresibijud.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5645903374.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/35177822058.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/39640206976.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/pixemape.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 10556 bytes
SHA-256: 33c921a5c7d494fb2741ec5a2549427afbd9b363f264f7b4b9cbbb854b40f292
font_01_sfnt_off0000c950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC950 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 15264 bytes
SHA-256: 00222e526ef41efa787231c535b8fe4f074ab1e060dcfdfb7875ae69b7d4d513