Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce088b0c53fdca97…

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 17:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcfca9486d6359130a9fa6e02bfef7b7 SHA-1: 5efe750f2c73556f53f5fa8332cd983605d5808c SHA-256: ce088b0c53fdca973506c4a9066df2df2021ee33579681b7d80db922b5a09933
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically calls out the use of UTM parameters and disposable hosting, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=nes+sports+games PDF link annotation
    • http://sydjpg.com/images/upload/file/20210915_202903_107.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/lufidewero.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/bipunatewonalegiga.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/37664709213.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/56805882087.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/ruliwuregafododipuvawa.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/kikoniwatenuvegabemefi.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/sifogiwowix.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/24504623410.pdfIn PDF document text
    • https://swiz.eu/files/editor/76270416272.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/19473175158.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/ratepukusabipadetude.pdfIn PDF document text
    • https://soechi.com/userfiles/file/wixomofafaxutogunifad.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614b531dbaa21---44580793419.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/14415775735.pdfIn PDF document text
    • https://cakkue.com/contents/files/64169298049.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/gizadesuv.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/kafiwutevidumibafegan.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/26926846202.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wezuwibewo.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/gojurapinupo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/madurigaz.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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 10332 bytes
SHA-256: 04cda83c7fb3c55e58e902676c6fa4c03f65578c87c4488eaafb76d41b57a564
font_02_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 14212 bytes
SHA-256: 13bc49064cd6873c53182243580f12429c387ca035808778fd0df63e3a5980cc

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