Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f80f925ea9cc90…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 05:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bbf940d919f8a0baa499e5cbfe0c0da SHA-1: 14c54205828dbdea66af2f2b111d7eba9d874329 SHA-256: a7f80f925ea9cc900bcb09490f13776adba49cd05b5c823d6a04f7a856f04989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=league+of+stickman+free+mod+apk PDF link annotation
    • https://minhkygroup.com/luutru/files/togomizedujisuzaradu.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/sunogag.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/13203481770.pdfIn PDF document text
    • http://hexindechem.com/upload/files/60368920435.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161394d104c6df---lowaki.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/85498491329.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/ziruwuj.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/37963583792.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/juzegumowetomuwupudirokaf.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/926137044.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/84257058073.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/penikilod.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/ravuxolidalile.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/dezurita.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/58703303756.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/55788728312.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/62179097385.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109260618548438.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/92648146742.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/57936466450.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/lurare.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bf6e90415579a859a9df38ca884d04ab/50568379976.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/92690270490.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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73A 11064 bytes
SHA-256: a2c1b709951f78ba809b12fb58ea3bfd26888f21b055ec789c21cb6e5c85d645
font_02_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 15008 bytes
SHA-256: 6236e98bcfcd7cc43b10e019739b3ea728eb363316f87907fa56466ba57aa6e2