Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9eeff117f986884…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 04:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53bbecbb9b551a32ae5bf19fdd2b05d2 SHA-1: 858412f6f334e371ac134f64d29ed7ee1a63a586 SHA-256: d9eeff117f9868840ea9f7174ac451aaaec198e64bad1ea6cc2e5ba930c93bc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's part of a phishing or malware distribution chain, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ku4ysk-9lgp4y.com/contents/files/mimifofafovaserafaso.pdf In PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/49693633106.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/sadogon.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/89440660134.pdfIn PDF document text
    • http://4yoga.by/pics/files/jatufepagawix.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210909_DA9DAF213B054134.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/nedodepasuxowobosifoxad.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/kodixukomuta.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/95152523876.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/54403449798.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fuxoxoduzedud.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa774d72dd---wafesotifadaweverewib.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/89972855738.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/buwazofovafezuwog.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091018353062.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/65163031567.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/75437547351.pdfIn PDF document text
    • http://julianina.dk/upload/file/matejisibe.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wufositimasulitafap.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gezogofazujogutinadub.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429b90d8eb8---45957020411.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/42393650985.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210916142427_kb2khl.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/zumugibonaxewamim.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/xofodudujekonapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=phone+root+shopPDF 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_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 19740 bytes
SHA-256: 9540a67ecc1c900ca8146ca425a062000245a769a3b321b43e3ae14d670312e3
font_02_sfnt_off00013fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA6 10048 bytes
SHA-256: 98b0ec96aa04aced0f1b5021b44bddbfd1b8fc778b551c50801e02aa30531420