Malicious PDF — malware analysis report

Static analysis result for SHA-256 d995752d44ba3eec…

MALICIOUS

PDF

91.3 KB Created: 2021-09-17 12:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cb241cd6b3cb511abd3e174559f33bb SHA-1: 13311cadf61a9ad9c8e7d1943fff140e40ffae16 SHA-256: d995752d44ba3eec5429487e2d32809230b3f3c120ceb98021e58aac19177241
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's structure as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/gufugomajofenaxovaz.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/30983037951.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/faveropipetaduzotuxodix.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sefusumiroxi.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/51368207211.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/46713459479.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910113543.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/xulezem.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/89418544508.pdfIn PDF document text
    • http://signauction.net/userfiles/file/31845766957.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/gorulufokolif.pdfIn PDF document text
    • http://chikatere.com/Upload/files/pamixaxu.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wisirafuzagaxurapekok.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/91785539808.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/26466acf6071b522ac957682a28d2ded/donozisoliriviraxodaber.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/sewagigitesawepelumiv.pdfIn PDF document text
    • http://7profi.net/userfiles/file/17521277313.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f50fd71f16066acd41b44bd0814a00aa/kusudiri.pdfIn PDF document text
    • https://phm.vn/upload/files/vetodorokiwewoz.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tubavaj.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/35712671007.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/bekofabox.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wajedas.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/dupimatonetifoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lietha+wards+read+onlinePDF 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_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 18100 bytes
SHA-256: 662b2ebfa9a0b3ae2bfe81406e9144747a096fe3db021adcf6edb8ad951869ed
font_02_sfnt_off00014876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14876 10388 bytes
SHA-256: d12d5c1a76394805c24f25920f04ecd861db83e1dd5d1c91e1d030ce8b730019

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