Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78efdc65dede482…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 08:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3f625d4c978428dfe3bfc73a73930b3c SHA-1: 08803c9110097faf551b2d9a67390641528b66f4 SHA-256: f78efdc65dede482e4bad1bd4b6b3d666fe3b33e55b471df407cceddd4f19268
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://apothepharma.com/upload/files/xolunawivijezuvezufolirav.pdf In PDF document text
    • http://studiolorenzino.eu/userfiles/files/71717731835.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96934093597.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nikoxadifigufugepa.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109102051549256.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/perizul.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/74469446243.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/nazobajifaberidipugilan.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/30944467077.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50766344717.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/vasebuvi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/xorebob.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/75474254035.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/31e38888d7ca9078efcaf8907b4a5ede/23103618199.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pameja.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367888e0c4f---75632789654.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/kuzunekuxepe.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/widufaviz.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/mefabumumi.pdfIn PDF document text
    • http://gazetavk.ru/img/file/xotuzilapafof.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/loforexo.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tugaxolikukol.pdfIn PDF document text
    • http://thecuriosityshot.com/35320116966.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/vefaxekam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=6th+standard+social+science+book+in+tamil+samacheer+kalvi+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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 17520 bytes
SHA-256: 23d1882066a3f6c7aeb89be1dd63a46cc43a3ba27c18c5df098f95a11831b9b1
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 11252 bytes
SHA-256: 5748a322c7f01d62b94762ceee4f41ab80a385c66e97baa013ed07c49df798bc
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1