Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc003d8bdc16f97…

MALICIOUS

PDF

67.8 KB Created: 2021-09-20 18:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a39b4444364e43996822fa554c37ebc8 SHA-1: 075623dbb22e67a710b0441f350102fe08d77f63 SHA-256: 8dc003d8bdc16f974a7386705990119dd75c54cb7e0d762c3cdb26d22a4247e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to link to many external sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest it's used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://atpl.aero/ckfinder/userfiles/files/50644750535.pdf In PDF document text
    • https://vroa.pl/chplusfiles/file/30909436125.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/bemonid.pdfIn PDF document text
    • https://faceless.me/userfiles/files/dikajidorodiderete.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/17395124775.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/52115598199.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd682a82b3---8534411615.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/xomebuwewoza.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/sepili.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/zuburew.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nukasatug.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/62b4a281b4a17f4b6b38767a49b154f5/simefo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/bakukimozote.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nodenemulonikujadimuko.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/45987588848.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gonirunugidurabemirim.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/dutigeb.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/96339401522.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xesuruzo.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/tutifor.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/91957214946.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/ledokaburep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=famous+african+short+stories+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_off0000ae05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 10916 bytes
SHA-256: 45dbf2712201cf4baefcc01b2588e3e7f18ce460ba22ed043ce9b9b08372d17c
font_02_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 14068 bytes
SHA-256: 96ec342982e9d7f18413dac033a1fd2343ee306de303288b192d0cb04e723fa5

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