Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b5b32d07fd317…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 08:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d83f9ba196eff2366dc1565c7e082a9 SHA-1: be0e45ab7de5069d436df98774df6cab8069becc SHA-256: bd4b5b32d07fd317e01059584787bcdb2c5c8d1263cad4fb45f042acb42d76e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://honyi.tw/ckfinder/userfiles/file/kusorimaxamuwa.pdf In PDF document text
    • http://servicedental.it/userfiles/files/22628704786.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wedajupulozokajarizunof.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/84942509779.pdfIn PDF document text
    • http://artepcb.com/upload/files/wuzowom.pdfIn PDF document text
    • https://digireg.nz/upload/zikixonitekov.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zepulanegamowez.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/79995499756.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/87586153635.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/12282569246.pdfIn PDF document text
    • https://eklyps.net/images/file/gotuxeziteropavujipu.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/68342432457.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/7976125509.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sokaziger.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/nerorimobajujoxa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/9172494644.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/fuloxagud.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecef3b03df---50305905380.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/54920647200.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/34628676523.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/10425449083.pdfIn PDF document text
    • http://dmkert.hu/files/file/jowuto.pdfIn PDF document text
    • http://futboltotal.net/images/files/62682801022.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/motexu.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/87058179161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=poco+x3+pro+price+in+chinaPDF 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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 10436 bytes
SHA-256: eac5edbe63d7b73e1020b84e21c913b15f8a40af9f9e473b301b7a11d7e5a963
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 18884 bytes
SHA-256: 69c36a3ca0e97933ba114fbde606e62c5e82859760fd9c794edb835447e0a580
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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