Malicious PDF — malware analysis report

Static analysis result for SHA-256 48724aa9bbbf9ecb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 00:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d55e29943fd9f22ec0689b9b73464cb2 SHA-1: 7d4de7facb76b60b1dd3d60b701be6975d411494 SHA-256: 48724aa9bbbf9ecb96c498e6be17b14c60144b55980986719881d5d7958f240b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=sat+2+math+level+2+practice+test+pdf PDF link annotation
    • https://binarbaidrealestate.com/public_html/userfiles/file/4625198384.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/45280714734.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/74466524784.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141667f6f3a9---jarovedarefi.pdfIn PDF document text
    • http://gaudi.tw/upload/files/sijolaxafotub.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/56255279222.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/rozuvun.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/loxofamudelima.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/zeredefakuzajara.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/86585256751.pdfIn PDF document text
    • http://tiguan-wiki.ru/file/92960799163.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614010ae20e79---lalunakazigawozisas.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/tunozomutaxazozexe.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bigabixik.pdfIn PDF document text
    • http://thevalleytrader.com/files/tikilimovib.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/4138981953.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/49071133780.pdfIn PDF document text
    • http://wenxuezj.com/images/File/38580279597.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/16246411674.pdfIn PDF document text
    • http://travellerisland.com/files/32308042442.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xisodujunowonomulada.pdfIn PDF document text
    • https://strechybenesov.cz/content/37376062248.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/2773354577.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/zemizidotesezoje.pdfIn PDF document text
    • http://a899.net/userfiles/file/jemegoboranevevofofogij.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/jaluke.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_off0000cf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF64 17024 bytes
SHA-256: d6b275acdbe35b6357d76d382f7a0f363b8e75edada99df4bb88939698047dd9
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 10924 bytes
SHA-256: f71471e5216d4912e2f49b15b0cfef852a2b8af9cad51b44e3bcf56af1b2be94