Malicious PDF — malware analysis report

Static analysis result for SHA-256 397352b8d122e4b7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 09:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3e2921077f792ff5bf731efa7c75d3cd SHA-1: 23e924ed9fe8a751f9ef259f19b932d6a46b912a SHA-256: 397352b8d122e4b75e8d87c5ca17418f2a6d00548a7ae93e5cb8465c255a9de8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of an embedded JavaScript stream suggests an attempt to execute malicious code within the PDF. The numerous external URIs, many pointing to disposable domains and using UTM parameters, are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=vip+guard+game+online PDF link annotation
    • http://stigstudiotecnico.it/userfiles/files/38169076251.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/pojipunepopet.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/junidawado.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/6434870203.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/wojasagugajudozakuwiw.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a67cb4e83---3463818014.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109162247374109.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140243cefa48---27751126690.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/bejawiweman.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/34803850769.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/96507449635.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pikilifer.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/daxotor.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/vodesexegopotawuvusut.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/44346564748.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-18/20210918101632991096.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901111824_1160669624.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/99272825585.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/pizapozadibaxomulezut.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/likisofexezezunifax.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/21549349585.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/rujosetodevozineworu.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/segejitifune.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202199162132884.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/wanonefivu.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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 10536 bytes
SHA-256: 7433ac8979b158ab31735051f8d09868a702a099473f8b038d92f3cb25845ef1
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 17788 bytes
SHA-256: 4a7d5ee64b988fab9af956234ca63deb6e7773a3a7ad7259ba2e19f4d45d7eae
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1