Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d4d4575a80ea45…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 09:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdd11c41153842b03cf8afc9c8418d3d SHA-1: 82ba17e578af12289759d92f254edfe43b17f024 SHA-256: f7d4d4575a80ea45e4e1b6bf68f667cd69a01f45b04bf90eed1a6f28af814ebf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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 http://jiachuankeji.com/upload_fck/file/2021-9-12/20210912012925993796.pdf In PDF document text
    • http://tourister.kr/userfiles/file/sulazipoge.pdfIn PDF document text
    • https://basisangka.com/contents/files/18773008393.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/musesivixaloxelasig.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/kugabowafafaden.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/nukeraforulagu.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/84517275745.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f315fb3d465913c058b27628ec142542/70639677002.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/migonusik.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fajuvumas.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lumakupikoxijimexuzub.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/62604295821.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/nivomeb.pdfIn PDF document text
    • https://harom.ro/files/file/90766571554.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/sorojudezogogu.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/26827971184.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lemowim.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/56357238974.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b1118724---bonugitubesovelonapax.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/20654128559.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/9234838373.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lulepifalixoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aot+mobile+apk+modPDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10396 bytes
SHA-256: 569c5985e53db51462fccd7f1ef9656b265df77f6a9cb915c2de92bdcd0db5f7
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 19292 bytes
SHA-256: 1de4b25ccd81899b089de0dfc3291bd357173e875685e44a51c7c301b86511ef
font_02_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1