Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1db6afaa9ac90a…

MALICIOUS

PDF

90.0 KB Created: 2021-09-10 06:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39b5c094f7f37e8784d39a596b340f1d SHA-1: 30d9a254fdd0401176a9025a5df7535486e3508c SHA-256: cb1db6afaa9ac90ab302171c04f8b148bd3d561f79b3c0371600fd1df37954af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous PDF_URI and EMBEDDED_URL findings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a71f36fee411f5a38b0466d6f6071af9/junidilogemojadisugokali.pdf In PDF document text
    • https://eguiders.com/uploads/viwum.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/3967803947.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fudenofepevenudaw.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/55775497412.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zudupigo.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/roxosemiladukuduwu.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/7349031657.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3032402678.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/webefade.pdfIn PDF document text
    • http://kalikraft.com/images/file/24289419066.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/dabigotub.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/kupegesokijimuwotewav.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/riweximibe.pdfIn PDF document text
    • http://beta-rc.com/upload/files/85824803351.pdfIn PDF document text
    • http://metall-press.ru/files/derosevafa.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/febuxu.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/sogubavevetuni.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/4311313785.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/82065738840.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/lazevawudi.pdfIn PDF document text
    • https://activepymes.com/pub/file/nepigu.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/5833582679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=drive+deeper+full+movie+watch+onlinePDF 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_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10972 bytes
SHA-256: 771ad9d864c5c9218cd304d16faeaa0ff22628133396a1fb95beb81237d2cacb
font_01_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 19116 bytes
SHA-256: 24177a36eccb6e87b7b428b0b6c40c1bdfa957a88ff3613d15d9ad8d8eb7b6d5
font_02_sfnt_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1