Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a086f379d8ed74…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 19:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e6f0667baf1c53faa26b5e43fb78850 SHA-1: 474807e6b56f4e2ae27355c38d481db529919a82 SHA-256: a1a086f379d8ed749fa10f02a9261e2f374f1c9787f266f2a7601c6e1ca099f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of these URLs being used for phishing or distributing further malicious content. No scripts were extracted, but the presence of many external links suggests a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=mock+test+for+jee+mains+2019+pdf PDF link annotation
    • http://www.findvoters.com/userfiles/file/goledej.pdfIn PDF document text
    • http://lejonhund.com/upload/92950791946.pdfIn PDF document text
    • https://blogsma.com/files/lenavuropetinukeliwesupa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137583525a7f---41163566503.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/65419676336.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/74830043651.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/69896318063.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/susogujujajibuwavibov.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109072152418846.pdfIn PDF document text
    • http://kvrhousing.com/uploads/61256698247.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/siwipukadisoretanisake.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/25461155868.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/3311776568.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/ratodiwisuxabunufovomaza.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gozeno.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/gizajafijeberewu.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/40192336108.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/naxozukipinemuxilotub.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/64446542843.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cef80c6f---jikadivipofezasogazed.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/64635043139.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/53592223242.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/195130673.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/vuvuxuzuludiratixobagiluj.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/najiwufukewosodoxedosu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 17340 bytes
SHA-256: 6ffa9d395192dc3774c80cd8a9643a695c82cd247a142c261c21be7804d32ffb
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 11412 bytes
SHA-256: 9887e1c8a74c942f66d3a4e6ec92ed2c1ba3f49cc30aab7f4a5583acc965a236