Malicious PDF — malware analysis report

Static analysis result for SHA-256 441e9b6a1fbcecaf…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 01:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3102042cefb0eeae952b34eb4a1e1c75 SHA-1: 8fa9a5b9f5d9b1c915c5463e3805805eab3fc0ad SHA-256: 441e9b6a1fbcecaf1f8d28cb419771a8bda17f02b6c13cc5b9da3cf2befa2d0e
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=flashify+apk+no+root PDF link annotation
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/satenabigikaxufosu.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/kemekug.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/45659011096.pdfIn PDF document text
    • https://alpinashop.bg/files/bigiwazuwidedojoluzesat.pdfIn PDF document text
    • http://xsteelstock.com/d/files/35396219157.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/gagisupafozagavaxeb.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202192614486823.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/22144478155.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/5465121877.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/murodupegirodoluwa.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/kofulowuranirot.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rubisu.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/wilirifurefapokexibebatin.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/jojefanukaniwetasa.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/fovuwavufun.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24999f237---69798990739.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/87534307224.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/69008150482.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/41257197433.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/pafilox.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/kekewejax.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/welutas.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/pukumopuzowepovubami.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/goditadetarenojubarok.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/lejon.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_off0000bb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 10508 bytes
SHA-256: de2ee5c1f1ef9048843ca085ab80870dabdb3967ff3d08578e2ccec86f7e504c
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 16716 bytes
SHA-256: 140e2f60f9190cff3f0060defe504a43e3ce62408e05a61dff25f2c07efa1355
font_02_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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