Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edf9501549ce98d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a90f3cb37d7a4586ff666d06e3f691c SHA-1: 63524003c09da1ef47250bcb2a28a8a2f3794224 SHA-256: 3edf9501549ce98d36af9e46873a1573524f66af7e574a4fd66f769e77859e38
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, containing a clickable link that redirects to external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to a phishing site or download further malicious content. No scripts were extracted, but the presence of multiple external links suggests a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=samsung+s20+launcher+mod+apk PDF link annotation
    • http://mrpokedb.com/uploads/files/vevisesurinas.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mujelokuzuf.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/wofeluwodunabuwefagegak.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0943f118f---55604634633.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/jalaxurofikitofanav.pdfIn PDF document text
    • https://majubesar.com/contents/files/zowimafilagebopepaluzed.pdfIn PDF document text
    • http://kleiberit.ru/files/file/16836078531.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/virapuzozazijukid.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/niliduvebevipotutovu.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/35786137013.pdfIn PDF document text
    • https://blgjad.com/upload/files/roxelesebotopapireruri.pdfIn PDF document text
    • http://1carl.com/userfiles/file/dejenobupo.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/90419633654.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/mufiridimidok.pdfIn PDF document text
    • http://ilovestory.com/upload/file/42541146957.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/vozakefevolofewegenax.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/5039236086.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/53265378857.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4c5a0cf2---nosewanokajaxiro.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/30779333818.pdfIn PDF document text
    • http://thegioioto.store/upload/files/57075235566.pdfIn PDF document text
    • http://partnercable.com/files/53994261482.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kesaxuzexatesijobi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/86262410803.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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 11280 bytes
SHA-256: 56f41bee9f45d735e0fed217f7b4f3c2492e636586ac40a59b9dce477b9be119
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 14320 bytes
SHA-256: 41cfd77b0cc4563f9def8a0701d8080d1bc32c135c858f201bad7537268439a5
font_02_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1