Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbf82289d824d67…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 17:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03396a907e2cadc62443564f9a59db89 SHA-1: 9dd85a1edb65562a7546e944fd1113f9b5c1c9a0 SHA-256: 8cbf82289d824d67450229d9f24b32034dfefc6fc6e8909dae077413c3d294fe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or a downloader for further malicious content. The presence of a QR code lure also points towards phishing or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://value.ae/userfiles/file/dirawolinerix.pdf In PDF document text
    • https://marathonblainville.com/userfiles/files/pinagobubifinuduvesadi.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/3302552612.pdfIn PDF document text
    • http://kaies.net/upfiles/file/98485722762.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/suzopoluvutipezixabowise.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/17895419057.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/42809803871.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/nelatesinazola.pdfIn PDF document text
    • http://matras-devison.com/upload/file/30293231222.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc94a7f22---ximobadazoderotodusu.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/29151175965.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202195436410323.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/dikavudirolabomifur.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/tebife.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/femagodawusevi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/joritibojawenulu.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/vimimuk.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/43779a7e29d8f15b7bb60cc644812f73/ginije.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/32480525375.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/gananezukebavuvureki.pdfIn PDF document text
    • http://ruresept.ru/files/file/919410627.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/joturulobepanafofita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+code+scanner+on+iphonePDF 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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10740 bytes
SHA-256: c6d3a5c95d318dcb7d382ddf8971a03d808843ebaec8a5f081f53faff6b45cfc
font_02_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 17312 bytes
SHA-256: 9b5dc414d62229a23f12329c378021564c9e7efb35ab2709b6298cbd713d61bc

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