Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd09d331d3f4eea5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 01:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 035377a355e2b513d078c39dc04b4f83 SHA-1: edbca66765657509e0fa6fe67c2b6460c9e4585b SHA-256: fd09d331d3f4eea53b83702a93deeb2d87ff1ef19759f555cf37f4684b6fa82a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

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 68 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 http://nedirajtebosnu.net/userfiles/file/bowapagusaronim.pdf In PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210912050915.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/6940949886.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/denuxamerorojemejitina.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/mezejikuzabejex.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109152129226199.pdfIn PDF document text
    • http://sql110.com/pic/tokalaxebolosufilarugi.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/88515012189.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://lsphc.com/userfiles/file///zujuv.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/44766602616.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/vagofewu.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/18698290292.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec324103a6---88358192524.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2c730162a---doleperujo.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/48544727073.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/324525983.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gulizazuwezugudikunal.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wixigazafu.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zurupemupibew.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/96698567036.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mozigutolowunexunapeluzu.pdfIn PDF document text
    • http://dhf-china.com/d/files/vukerekowexisu.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/2010575045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+sword+game+for+androidPDF link annotation
    • 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 10792 bytes
SHA-256: f9f9237c40510374a9e5c1b05a83fdb1491c0a0b59c7971765fc60d6a9764775
font_01_sfnt_off0000caa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 13988 bytes
SHA-256: 43ebdee4ccdba50d711cc8c7f56c1daf9d8b9971786338b9e2a83df67c037172