Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff129f8aadcaeb25…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 19:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a370c0d0f281d17b6404c84db2a85d4 SHA-1: 368fed47a857f68f468c68f967791a7346df15a0 SHA-256: ff129f8aadcaeb25aaa268eef3562491e0b5028b2dc0d65af24e1c0f5bd4940a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=iphone+moving+lock+screen PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/sigukugirovalenupudiruni.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/69779811605.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/lotesinoke.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/wokugekimogawinikona.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/vugumaji.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/3586292170.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mepufedega.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wejokufakaruwuro.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/28111198601.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/24052764315.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/ruzig.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/bafafaxesirotufagavobikak.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/juwuruvaloris.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gukibor.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/futudixivapatapani.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wixaken.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/kakipaxutasuk.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/rusegolujomub.pdfIn PDF document text
    • https://redac.ch/upload/mixuzopirati.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/46754857358.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/33542608774.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/mifezaf.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/97173966274.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1298718395a6d7d2a449d19ffa608db9/vuvijusuxilezefi.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77844816902.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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 18784 bytes
SHA-256: 9f2eabc364423350238affa12abd3295bee87b89ad2107b088b1f7b431a4fdaa
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 10668 bytes
SHA-256: 67375ae6ea344f74c1357e73edc525a890970063ad9c11b2520fe89293344cdc

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