Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e572f1f2e297fe…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 22:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc9c19f1441611264249e0d26862509a SHA-1: c5b7387bd9aaf71b17cf2e594c0edf6f82538ae7 SHA-256: 13e572f1f2e297feeb2257fbc23232ba4019d8337dde41a92be8955c5d669fe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to various PDF files hosted on unknown domains, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cb3089cd112b2f174e2b8f65af026ab8/dogeboli.pdf In PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/98835936788.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/77019015037.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/14678592762.pdfIn PDF document text
    • https://preciseenergygroup.com/media/donuzanonomupamag.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/87896506159.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/35834287193.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135863b9f5bb---kowarusemudepafudiwajiwa.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/23936926284.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/razujixu.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/19465368824.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/xukezejemadenunogakun.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/66246455173.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/likaxidixelilimetadeba.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/5631580691.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/bodajita.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/katujisevetogiworu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/94271821925.pdfIn PDF document text
    • http://upakuika.com/img/file/17713163565.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/56234965488.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/42851364136.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/xezom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+apps+for+android+mobilesPDF 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_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 10764 bytes
SHA-256: b42bd5c6422864b3df3eaf72ebac1d8261571c0f8d572e386f55ded7056fa40d
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 17672 bytes
SHA-256: c17b42c97482934eaee4f182bb018df0092123c494198cd3dbd01285ba095f65
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1