Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecff0e907152e5f0…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 11:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d728398c2cfe35a7bfa372a34d11423f SHA-1: 453f1fa37792dab6c73c00a315ced4d0b3fec9fe SHA-256: ecff0e907152e5f0e17aec1ee065f5466dadb6b6989594835a1d06deb651108b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URIs, including one pointing to 'smidgel.ru', suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, aligns with common tactics for hiding clickable links that lead to phishing sites or malware downloads.

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://smidgel.ru/uplcv?utm_term=descendants+full+movie+putlockers PDF link annotation
    • http://leoclubmarsala.it/userfiles/files/pojubadasumozowugeru.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b7a33f5e0505902a3d9d0ea4fbdaa40a/nagorarutololuw.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/xejolow.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/watesovuxutijokeluxames.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/88588698723.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/zapiti.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/wozowijenu.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/88681408090.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/sepiporikew.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/23893534139.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/sazuribixedepabumuzelo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/maluxewi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/napewigosizezogozizi.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jeredulu.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/rikelotolinarevuzabixoku.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/95589215936.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/zorexetawago.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210925_185428.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/38312812956.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/votenoki.pdfIn PDF document text
    • https://vitanov.rs/files/10016084125.pdfIn PDF document text
    • http://master-br.ru/img/file/3584335416.pdfIn PDF document text
    • http://contextuae.com/resimler/files/putufugen.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfa7593ce1---94108807846.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_off0000b144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB144 11040 bytes
SHA-256: cb77144f06e4d243c69f800db84d92966059296cc8b21cf4af81665aeb45d8a9
font_01_sfnt_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 13908 bytes
SHA-256: 17903e35b7a71a921bfd241398c6faeb56d12e745194d8d963b895aa6830147e
font_02_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1