Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e510d6d0d4206a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 22:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdb640a19fafcb3900ccca754ea94636 SHA-1: d0c57f440ca6eb083c22e2c9a8e77a5fdbb9e7fc SHA-256: e2e510d6d0d4206ade25a6ac26aeb86d0c3b407b087a8fa409b72f4bdb872ce3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one URL explicitly identified as a disposable hosting link farm. The primary purpose appears to be directing users to a network of potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rafaelokazakov.com/file/64721645922.pdf In PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/53714817844.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/retutedexewagur.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/56894836527.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/gosozogarifudusud.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148db41aa9fe---xagazameroginusibotuginoj.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/livaga.pdfIn PDF document text
    • http://potlista.com/file/files/dazovemiz.pdfIn PDF document text
    • https://airxps.com/userfiles/files/rurivutejexalik.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/72638571959.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/momofibup.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zafurafebirobitaso.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/99012898234.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zarokepuniv.pdfIn PDF document text
    • https://pratham.one/file/detukad.pdfIn PDF document text
    • http://01host.ru/userfiles/files/8967084487.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/87067118575.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/98599364401.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/dukemeravotadokapin.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/40894024702.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08799bbec---64634739824.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/8375081278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+changing+default+appPDF 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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 10812 bytes
SHA-256: f63c805697a6fe26fb9e2b24da1f2d8d56da8c7220b8e480becc19151753c749
font_01_sfnt_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 15064 bytes
SHA-256: 517b1501e4bb5efe08c453d01349a34dc2ee91af58ba45e08153921f39dae793

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