Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b6e7e09640df9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 00:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 180acc127d354aafcf4fef1e10f980b4 SHA-1: 1b398bfb949027dfe42056f8a8e3ce571b7dcf5c SHA-256: 0a5b6e7e09640df96819e251ce3f6a73016bef1256d8160d8e1de9a34efd63ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=first+minister+of+magic+harry+potter PDF link annotation
    • http://veterina-naslunci.cz/userfiles/file/boxafawodazaxodimirumumo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161496460df468---60314103761.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/jufosama.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/benuxavas.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/kakeben.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/50179587082.pdfIn PDF document text
    • http://kdekdyjak.cz/data/nipelezes.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/39751862576.pdfIn PDF document text
    • https://bloc-immo.com/images/geravegaribusukizu.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/52396022073.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazuvaweretupo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/sanefedibusesijerer.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zigifunegavelavekobilo.pdfIn PDF document text
    • https://el-tall.pl/pics/file/21551808423.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/16971052375.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/48176903622.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/jexonitenilul.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/10255855977.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rafagupo.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/82831950875.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/91184341602.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/76805291059.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/xobisovanilatotiw.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148cfde95fc8---72624672869.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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16432 bytes
SHA-256: 5749c910eec839924164ddb58bdd80b207070d11bbd51d725c55465f390f9b28
font_02_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 10972 bytes
SHA-256: 5f582e2139af3fe21248c6d7413d7888b7525db4daf8c80d069de4469bc2f0d7