Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169ba31beb9a557…

MALICIOUS

PDF

90.9 KB Created: 2021-09-14 01:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7e88fd1b63f9aafd103b88d8c073250 SHA-1: 845e77bf4c93e219c06536786d88ea96b1fff03a SHA-256: 4169ba31beb9a5578cb5f9e9079f6895982f43522bef661e4a37f0c9f7a994dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://patriciogaete.com/upload/file/tenesamu.pdf In PDF document text
    • http://historia-bfured.hu/userfiles/file/lurifixom.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/14401040654.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/6123115600.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/nunovoserikit.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/46295809436.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/36075002316.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/nogetuxaf.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///basizawikumupajejuruveg.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kazuzaximiveteripekujilad.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/kevuzera.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fapb11d4bifjje487tdgorvmo6/zewija.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/rupaxigilasanuxuj.pdfIn PDF document text
    • http://serting.eu/userfiles/files/34742609823.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210914040945.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/rezawiwufo.pdfIn PDF document text
    • http://grafitym.kz/files/file/36549312179.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jilolomala.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/80282927661.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132041ac5e2d---juxigasiv.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/62507698994.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+house+of+the+dead+2+apkPDF 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_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 20240 bytes
SHA-256: 3b620f82c15e12a0a6ad0d276079d7c9254d97cf941744dbf91158f4e779a958
font_01_sfnt_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 10528 bytes
SHA-256: 11153013f5db40451d9c8137c1c5141f02d496282f51557640ef91d71566d9ea
font_02_sfnt_off000145f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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