Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e11770c4cec10f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 17:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48833d5910bc97a29d08c1715a71d20c SHA-1: 8ece6a2b379456631b76f897381be5751e507ff3 SHA-256: 91e11770c4cec10f9757cc3eeddc2601c6da1db38ca06448634497fa8566ae4f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=how+to+get+free+passes+on+episode PDF link annotation
    • http://strelnicebudejovice.cz/userfiles/file/69897134756.pdfIn PDF document text
    • https://mauspro.net/upload/files/18839254644.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/44696944930.pdfIn PDF document text
    • http://geodez.com/pliki/file/98876000261.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-13/images/files/77440954196.pdfIn PDF document text
    • https://artbynela.com/uploads/file/32944284250.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146852e61b02---zimel.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/piwefapemudefo.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/fabiw.pdfIn PDF document text
    • http://netflor.pl/upload/File/14140876514.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/38159889880.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109030707145946.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/jamonazanogepurigodowipaw.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/medojixumiluzatux.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/11698601662.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/mivanitukato.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/wemomidulufefolidipuluvuk.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/810890013.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/gamugatulefoxova.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f544a8f104---59658048479.pdfIn PDF document text
    • https://aneri12.eu/res/file/36346038594.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fasabezazagozovulebarolir.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/3440359183.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/15282346962.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zelilusuwimojeme.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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 17312 bytes
SHA-256: 78fa7b9b12ccde203e1d3ad49102e99a0d2886282e904c21b330e5779327d117
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10704 bytes
SHA-256: 1e22231925e7414cf608e63e2509760eda6a24f8e937bfae0614dc4f3fb2f30c
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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