Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e3b57cd5996b51…

MALICIOUS

PDF

80.6 KB Created: 2021-10-04 13:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0eb7e7afc1602e394c40f7e5d1859084 SHA-1: f6a6329653f61bfd24a124c8d2d288ce3d05394b SHA-256: 14e3b57cd5996b51270bcd68117f2cd60a76f18c4c5b51a5a7ceb037bb01d867
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many hosted on disposable domains, suggests the PDF is used to redirect users to potentially malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+lower+pdf+resolution PDF link annotation
    • http://steffis-strassladen.de/userfiles/file/45929430278.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/35686501105.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/dixomolavuvuxa.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/78832368904.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wetaguvorufuposokovedu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/tatarijikatinagisu.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/32854733646.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/xafazaraneloberuwowami.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/49efd7abe1761b24184f3840c8c9563e/sakowupodap.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/34395952212.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/47733520498.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/dolujajexosaxojutonekep.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/wedolafafebolanemezum.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/36291467400.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/34635149254.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/71897018646.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/vesowufajenofisatenodax.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137028e3e52b---gawim.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/71021029031.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/50974524764.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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 10508 bytes
SHA-256: 1df838994e64b80de06d6e978cc6b98dda90d552124fc4c2b87f443737cf942b
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 18748 bytes
SHA-256: a7be7dedcb6f5d89bb4fca4296db3985da21292ec113579b1a22bce11adf1186
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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