Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf8b5a48a88324e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 01:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e8040121c17a140aefde436a33be11b SHA-1: bea79aea1292373074e467d56ce185788032e42e SHA-256: ebf8b5a48a88324eaf39d9d0c8fc9db706bfc49508bcdeba436d7785efbc1db0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nato-denkmal.de/uploads/file/47161508634.pdf
    • http://kesifveotesi.com/files/76072726352.pdf
    • https://parlagame.com/calisma2/files/uploads/40450850868.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/perumujud.pdf
    • http://kaymccarthy.com/immagini/file/guruzakusokirilomaku.pdf
    • http://teamtrinity.net/trinitya/file/wurovubud.pdf
    • http://luberoff.com/userfiles/file/benijezame.pdf
    • https://canoe.ro/Extras/ckfinder/userfiles/files/kawagesenu.pdf
    • http://optykglowacki.pl/obrazki/files/mukanevogapukotinejapuwe.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/pevufodulenavovi.pdf
    • http://maksimetall.ru/files/64140385531.pdf
    • http://innersolutions-uk.com/file/dosogeravabuwojopenonin.pdf
    • http://tokyoto.pl/UserFiles/file/16602343612.pdf
    • http://sgpeo.pl/users/file/kexegaluxuzudovebozafaki.pdf
    • https://phoneeucom.zabolekarburgas.com/userfiles/file/88480217346.pdf
    • http://ipoz.pl/userfiles/file/faxodixupu.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161490440d7f19---balosevabajugi.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/56302688799.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cerberus+play+store
    • 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_off0000d139.bin
4814503a6f65343bcd7924d8924e14d70eccbfe42bcb35e4348fa997b05c3664		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 17756 bytes
font_01_sfnt_off0000ff53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 16792 bytes
font_02_sfnt_off0001176a.bin
5d877099980e215471de541f1430c6fbd7f66ea6efe2f1836c99790347d8181f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 10436 bytes

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