Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718f30d7ee96acf…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 12:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 713bcda81fed8817a5451b37386c39d4 SHA-1: 2431a22372a9e1d9375b6eb4358c17ceafb3e7c0 SHA-256: c718f30d7ee96acfac043daf4b92c51a19ea95c7bc1444503f33e1bbace47552
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ivankotov.ru/img/lib/file/82200583072.pdf In PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/tomajesizarusonexedufoz.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/daxurexuxilan.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/59171935594.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/9998779257.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/karexuxekodojo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090506440671.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zigavivexibipuzon.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/56848904506.pdfIn PDF document text
    • http://xhzhengli.com/upload/68892050685.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nuwisuwupifoxirebilolap.pdfIn PDF document text
    • https://ivanamihic.com/files/23305604226.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/70148360968.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/konamodamegexapo.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/84203683775.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/14526437768.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a4872adffb60420fbb8b123475dce03/warimurabalonujopase.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gunobafogawutimusadiza.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/pokowubilug.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/vabesipobixidewuli.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tawareti.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/40010799447.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/buselodakekemexaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2+year+chronological+bible+reading+plan+pdfPDF 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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 10912 bytes
SHA-256: b47f2f3a71653a26e0bf14b3227dcd892cfb37420fae54e07760a202625f97d5
font_01_sfnt_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 14184 bytes
SHA-256: 5196f7769b9fc8bb542e482bbb81c3b4dabdd3ace3d9a533163fb6d8b59cc7cc