Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fddb36cccefd612…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 17:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1c2ca2e75184d90348c8a038d1a744d SHA-1: 1326c0b41319673cdc27214496680ec2e0eabdd9 SHA-256: 2fddb36cccefd6127bf173a9cfc9697f0985e03bbf51a2095500b83c5e4dc055
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/17506715113.pdf In PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/70170945728.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gibewikiz.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/97183632678.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/kotufime.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/ximab.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/xarenagafolugogano.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakezene.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/9183140680.pdfIn PDF document text
    • https://hoalavender.net/upload/files/12990766202.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/11645374458.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/51326336881.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/17687378195.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/vivubajufiz.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109151621032460543iz1wi.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/sebesanezikatozulizasijux.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/gubogirolala.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/dorobolorimuro.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/labebat.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/4651809821.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/34786284322.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/66055380388.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zizulenironerevasegobibik.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8823346707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=guided+meditation+with+jason+stephensonPDF link annotation
    • 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_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 15816 bytes
SHA-256: 91856c37169c5569d8afe0f965da12df5e8251aad4ee145486627a0ef7c57531
font_01_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 10864 bytes
SHA-256: c9db481cfbd1ad14c80f08da8bc2e242588e701cc9eb9b38634a0853c23362d0