Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7cdd5a34a15e89…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 13:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a1f859b5c39a173b196ccdfc8b1162b SHA-1: 1f8c4f94c6038c0235d2cb9cdc03448deb3a9963 SHA-256: be7cdd5a34a15e898eda8ce48afff1d04780385b68f2e17ae83871046ee30f87
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of links, likely for further malicious activity such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pincailight.com/zk/UploadFile/file/2021090105114973499.pdf
    • https://escritacontabilidade.net/fotos/news/file/nivezokuwo.pdf
    • http://mega-treid.com/userfiles/files/gitufudokukevizupo.pdf
    • https://ww150008.linebot.net/upfile/files/20210925131419.pdf
    • https://ans5680.preneed91.com/upload/files/gesiwidovuvovusi.pdf
    • http://caycanh.vn/images/fck/file/rawejon.pdf
    • http://www.trisad.kz/ckfinder/userfiles/files/22161302088.pdf
    • http://hichipper.com/hichipper/uploadfile/file/2021090201484273499.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gokefixox.pdf
    • https://ladymamashop.com/uploads/files/202109072142331711.pdf
    • https://successalpha.team/upload/files/97774609985.pdf
    • http://neteyes.eu/editor_up/zipimu.pdf
    • http://kme-kme.cz/files/file/21034137278.pdf
    • https://madeinstlucia.com/userfiles/files/7759472844.pdf
    • http://duocthientam.com/uploads/ckfinder/files/90650241905.pdf
    • http://itcck.org/upload/editor/file/43751531499.pdf
    • http://aktifithalat.com/resimlerfiles/jotizugifozon.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a056887aa0---74682781875.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/52501493799.pdf
    • http://www.uc-kushiro.net/images/library/File/87583513521.pdf
    • http://rambud.pl/uploaded/file/wafaremegewixeb.pdf
    • http://camel-republic.com/media/userfiles/files/revatalesinidefitosaba.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/72279619151.pdf
    • http://tubietelbar.hu/uploadfile/bozaxukepa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=imo+apk+for+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 16792 bytes
font_01_sfnt_off0000c901.bin
d715429d6dc0ab093c4c38ff0a9e6dda1ecc9b8d7198371f96edd8af316dc812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 16728 bytes
font_02_sfnt_off0000f372.bin
79a7f505d3b7927ddc22df3be00bfc464252813d722763aaafcbd9e774695db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10044 bytes

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