Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d46c59e37d802ae…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 03:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40f1049886a167622ffc392ac6dd3eff SHA-1: 3776053cd88ba7419c0208acb918873029dbf715 SHA-256: 3d46c59e37d802ae7adff33eeab70e32bccb23912215bda1361c04703e1f508c
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of external URIs and the overall detection profile point to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grancom.by/upload/docs/tibiraruxuxarom.pdf In PDF document text
    • https://giritrademark.com/content_files/files/guzonomobalunavaza.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/92830224896.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/guwukasagif.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/31033175261.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fagita.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/58458219223.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161489868c46b1---petagubimedenov.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/47656684064.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/85580342697.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/85660904151.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/suruzipaletogimolukivi.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/63284335614.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/61508437186.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/82273495284.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/tuxebogadija.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/jutifawevetigeduxuvo.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/74761970595.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/47652556715.pdfIn PDF document text
    • https://razredna-nastava.net/files/temariboxaxa.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/75546568857.pdfIn PDF document text
    • http://asfalon.com/__files/file/48370737346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+action+launcher+plusPDF 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_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 10800 bytes
SHA-256: 0159b57c3f06237b21b5aac09d2654dea1f1d0ab97cfc6cda050992ba8a0b3d8
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 18116 bytes
SHA-256: 5a51ff1f3da8d668a734851bb416ce8b81f812e9fffff940bd98c03431e7b82a

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