Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f88c5ab5ee4d790…

MALICIOUS

PDF

66.5 KB Created: 2021-09-29 05:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0dca0c19a44881dd2b091ef2190ca971 SHA-1: 7809f92a25bd6fbdd85cfd6923260aca067edd5a SHA-256: 8f88c5ab5ee4d7906336c4eae189e84285eaa409e955bdba8e90dd96c0482580
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded links, many pointing to unknown domains, suggests a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7937

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kolbandibileklik.com/resimler/files/libaxununezoxenarawexi.pdf In PDF document text
    • http://dreamcatcherltd.com/userfiles/file/firex.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/96979997933.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/lugazutabuwibuwenig.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/zakujalusodizof.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/risowododisolu.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/6894235712.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/fajasofew.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/74397867096.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/jepevabezaxunaforakaxup.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/jijawa.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/pudevidowezi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/3398420307.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/53279603725.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/kasiwifoxanirigodago.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bubidi.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/wenefinegepotasuwavubinag.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/volonudil.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc78b8d75---bemidizukafadowezodad.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/93391191537.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/6616391354.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/zodojusasimutil.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/vineziwunurobiminatuvidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=come+creare+cartelle+foto+su+androidPDF link annotation
    • 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_off0000b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F4 15232 bytes
SHA-256: 564f1551fb627b4fe298e05ce49ddd3f053e147128abbebae0ff3d6f1561e124
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10768 bytes
SHA-256: 25eb9d91f2b3d47aaff703de558430ccb7288e4ec0cd03fe55e3781ab85a916d
font_02_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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