Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f5760552054b26…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 02:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b2ba4c1d25874b2018c9f0de252c95f SHA-1: b0cd608852ada8770859af3f664c346e4b867e18 SHA-256: a9f5760552054b26582021540280ead969b495eb90bc6a91d0cb9deaa80bc8c1
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 malicious intent. The presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm structure designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mvmdigital.gr/files/files/tavumimogutujara.pdf In PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/98855091523.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/4156723876.pdfIn PDF document text
    • https://grancom.by/upload/docs/19212448075.pdfIn PDF document text
    • http://djpress.pl/Image/files/bafugirarerunupeji.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/dunonemes.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/parapuxujukakiweraxamejuw.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/pajinibufuvezuxov.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/kesatonufikoledosusetazer.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7917c65c2b5473c16e09396f7c35f413/75472539467.pdfIn PDF document text
    • http://julianina.dk/upload/file/21253514250.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/45644369126.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/nujojil.pdfIn PDF document text
    • https://pecintajp.com/contents/files/gasuzugu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/17865294457.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/besudusibanuliwaju.pdfIn PDF document text
    • https://proia.bg/userfiles/file/75235341325.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/soduladat.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/fugamogozipeteta.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/zevirosare.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/xadidedifaxiwonikoxonota.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/giloz.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/67844138084.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/79623142674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cracking+the+sat+2020+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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 11096 bytes
SHA-256: fa47eccc8f3ec8ce7e08c4a804a274937fa1c0329b9d649b2cc9f2603884f879
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 18200 bytes
SHA-256: fb48be5a6f8ce430a739aa68a215261440988ae25cbcae0ea1d76906e9b4683d
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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