Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14a76fcc10ef6a4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 05:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f9152f84733de9e0261b788038eac5b SHA-1: 951dd0fde62384e8f9984b8bcbbb4c862e760c20 SHA-256: e14a76fcc10ef6a4ff65a7cfef808f901323ca5cdd4c4c1db5796cab3c2b566d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the true destination or distribute malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to evade detection. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gleb777.com/fck_upload/file/95034703460.pdf
    • http://yokosohk.com/files/fckfiles/file/65250456082.pdf
    • https://satesayap.com/contents/files/75222018308.pdf
    • http://homeopathyhongkong.cn/files/75894880005.pdf
    • http://panziofabian.hu/fck_kepek/dowabo.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/bibizasek.pdf
    • http://fcvperu.org/data/fcvperu/userfiles/file/jomibizuwimoxujarukode.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/mawojefo.pdf
    • https://posetili.ru/userfiles/file/begedozimebuzig.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137350b39463---41009766127.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210914092238.pdf
    • https://pomtco.com/technical/files/file/75253673610.pdf
    • http://nicenpos.com/userData/board/file/pirabugesujerekizupiweliv.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/19703641457.pdf
    • https://tavio.ru/files/file/54460063897.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e2835ad76b3470001873a9e669a19043/residenabadujulemufivem.pdf
    • http://veganogle.es/uploads/ckfinder/files/xowogepubuza.pdf
    • https://stijsr.com/userfiles/file/zosivazeluzepobale.pdf
    • https://kientrucqhouse.com/uploads/image/files/7754441637.pdf
    • http://hoshitorionline.com/uploads/files/muxuzerimubunivuw.pdf
    • http://hexindechem.com/upload/files/50651155618.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/pirokazunozoludepeda.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/38407238529.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fingerprint+screen+lock+app+download+android
    • 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_off0000dee1.bin
c2de5b2352db63ab9e46432c50e1edb4e0d81fdadc3395b08b0efcfa790b41d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 17316 bytes
font_01_sfnt_off00010bd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16792 bytes
font_02_sfnt_off000123ef.bin
5993e5d967bd643a0e6961d52ae5e994b693675a13ddd2bf1f2f3bf93b7896bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10844 bytes

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