Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e78c7276b03b3d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 15:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4d7ded45a775d021c5c9871ad472fc3 SHA-1: 0e5847ac4d0c5a283db2f3fde92806e917d1ed25 SHA-256: 92e78c7276b03b3df4ec547cefcd42795b08936ca9cc2415ae52470660c747ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is used to host a large number of links, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pistant.ru/uplcv?utm_term=nba+apps+offline PDF link annotation
    • http://njchemland.com/upload/files/1478863558.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/bodowubagimufiviworef.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/65858270381.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/84772922812.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/90499469644.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/waxugug.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/11219800922.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/nogedezuxetikinive.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/69102957298.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161340e1d85e72---81647674686.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/84416570125.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/timezol.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jevax.pdfIn PDF document text
    • http://riviera.az/userfiles/file/53906622898.pdfIn PDF document text
    • http://bscartridge.com/pic/xasuvoniruduzeroweso.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/molusapi.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/83728622641.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/karetexotanamulewu.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/zagajofupegotedajiludi.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905064358.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/91315659459.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/sufifoz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/94d5b1c9c7488f971890c078e9b7ba1b/42173054855.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/sidukejonim.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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10268 bytes
SHA-256: ec6d825143a5facd93f507fcd9db638f9984b05cee68b844e1153e068ce6f632
font_02_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 17624 bytes
SHA-256: ce1231a84f2b15c4b1d09056df134aec3184824e2a0cdf785cbc309e996e55f2

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