Malicious PDF — malware analysis report

Static analysis result for SHA-256 24323f3d52dd0815…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 13:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b60291d8d335c44fe142d6a8411c0fc SHA-1: 4c7e5fd109ac0fc04d758f36646c475e1c374d43 SHA-256: 24323f3d52dd081584b93c504f0de475d9eef27a47831e0f523c14ffd6b15231
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads via the linked domains. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=f1+vm+app PDF link annotation
    • http://aktasmatbaacilik.com/resimlerfiles/wipinatodonedofura.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/botukax.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/rarupo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210908165839.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/palakerivem.pdfIn PDF document text
    • http://arucax.am/user_images/file/nusowizazobodaravazip.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/datupu.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/zedavulinowusupuvutaben.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/zapole.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/29659674548.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/ruzepegovovugi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613589aac371f---95081296762.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/24172429777.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/8646560503.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/voladonutabifomiz.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/denovuvubevugomikig.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/8108169091.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/9098604094.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/potiguvananuwedemorimoke.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/54136190690.pdfIn PDF document text
    • http://strap.sk/uploads/files/95087403161.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150f5fe5eba7---21431054395.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/72014462082.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_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 9648 bytes
SHA-256: 139dc49a9ace6ce9e7dcac8aebcfded00e308ab7ad9e6b66e45d2893600f74da
font_01_sfnt_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 17344 bytes
SHA-256: bf868fb7c7d5fc5db43e81d0119c686245af58a5923918e9875887d9b88b294d
font_02_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1