Malicious PDF — malware analysis report

Static analysis result for SHA-256 b892786f7e669ee8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 18:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66633cb03a7f71771a2549f990ff59e9 SHA-1: 161f5cc354407f4b3c55a7dacaafb68de6642df7 SHA-256: b892786f7e669ee8e23c660c22b332f24eaabf6c874e320cbf5f1b1e7bcf5627
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external URIs pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is part of a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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://philabc.ru/uplcv?utm_term=gta+v+download+for+android+full+version PDF link annotation
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/gasujirunaramebafono.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/99828733283.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/35665703448.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/lorigofegekipax.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/20722440691.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nuliposufosopizafiwisowe.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210922172850.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/totexezijuzutitupo.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/silofinejimufu.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/varuj.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/63816993393.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/kizolusa.pdfIn PDF document text
    • http://jstreetconsulting.com/userfiles/file/85256347922.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/12618692283.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/tokuro.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/nosituxasoxirixidoropor.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/lexudufajekusogififa.pdfIn PDF document text
    • http://ed-union05.ru/files/file/sowete.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/futelokiledefirate.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/wubadufawupade.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/5142364078.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/70535265638.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/25868024884.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/13484063597.pdfIn PDF document text
    • http://logicamail.it/draft/media/wogev.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/mofamivodubaba.pdfIn PDF document text
    • http://perksys.com/userfiles/file/76367837756.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_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 14572 bytes
SHA-256: 2b95293c4306afd94a6c1cedb72db67dbedacaa40bf955340560590841cac101
font_02_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 10636 bytes
SHA-256: d783ef152724eac00c788166a6dd316a7fa4eb22232e6470f72c65ce2633535f