Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed57d732eca553e6…

MALICIOUS

PDF

100.4 KB Created: 2021-09-20 14:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ad5301397fc25838ed2b4f0a1bc0a4d SHA-1: 408c545811507b8890dc998b93a51cdf352d77b2 SHA-256: ed57d732eca553e6d47afefad446ef0f35c50ac66eda3285478c7c2c136ac799
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests it functions as a lure or downloader. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=lightsaber+dueling+styles PDF link annotation
    • http://cjmfgx.morefriendship.com/upload/files/18349440933.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/46646050699.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1acb3d3bf126ac807c245fa3eddb64f9/57740439047.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210905031123_1271437119.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/1579499395.pdfIn PDF document text
    • http://podarox.ru/public/files/84761596333.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/lakevemafukipididukozega.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/vilafamavupokezarugul.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/xituwapozusixidutisidofe.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/61639826604.pdfIn PDF document text
    • http://groupkaishan.com/d/files/taxutiwude.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-17/20210917200821788364.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/81275622330.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/shf0o8jc5c63klm56591d9u02a/vigiboligadofifoge.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/zijesopekej.pdfIn PDF document text
    • http://zzweien.com/d/files/zibelatilasu.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lunijogimaw.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/tevedufesezofopabokotite.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/kaxadevokewesu.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/wevuwar.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/82997284448.pdfIn PDF document text
    • http://megalaserasia.com/upload///xiduzosimaxatowanoxajak.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_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 18260 bytes
SHA-256: 35684f2238ee8b8d2d5380bc5f9024ddd8573cd10159c645a98b64e4726aeb7e
font_01_sfnt_off00015353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6A 10716 bytes
SHA-256: 652611887becd08807a843b94adc1b329999af9979d4415800089eb2fda144cf

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