Malicious PDF — malware analysis report

Static analysis result for SHA-256 411d36a73918164f…

MALICIOUS

PDF

77.4 KB Created: 2021-01-23 12:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 59e512821aa24740babef14528090171 SHA-1: 27013a15f9d5a86fdc825b40fa6788280039de7e SHA-256: 411d36a73918164f567c79dbd599c09567d6edb0dee32da676edc692e57e67f2
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'Cg police gd admit card 2018', suggesting a lure for phishing or credential harvesting. The presence of numerous external links, many pointing to PDF files, indicates a coordinated effort to distribute malicious content or redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/aws?utm_term=cg+police+gd+admit+card+2018 In PDF document text
    • https://bepirujeli.weebly.com/uploads/1/3/1/8/131856565/vapomolodov.pdfIn PDF document text
    • https://dibarovufi.weebly.com/uploads/1/3/0/7/130776786/88de6d58.pdfIn PDF document text
    • http://salufogi.iblogger.org/criminal_law_luis_reyes.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/pugosixiroko-xilawariderida.pdfIn PDF document text
    • https://tidukunetubuf.weebly.com/uploads/1/3/2/7/132710673/gezatilozufod.pdfIn PDF document text
    • http://kafixerutatad.iblogger.org/remix_barbie_girl.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/a047ed9ddc.pdfIn PDF document text
    • http://belixawotid.66ghz.com/cima_strategic_case_study_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvisupejigu.epizy.com/67343290832.pdfIn PDF document text
    • http://tawosowi.epizy.com/fozorulonorunewolomar.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/50450652578.pdfIn PDF document text
    • http://wijetifosoxi.epizy.com/77203832375.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/femoj.pdfIn PDF document text
    • http://jakunivejejaxo.rf.gd/escheat_reporting_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/alphabet_sounds_flashcards.pdfIn PDF document text
    • http://segoxegigo.epizy.com/48038403690.pdfIn PDF document text
    • http://molutuganum.epizy.com/dipitozud.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://scripts.sil.org/OFLIn 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 5640 bytes
SHA-256: e50a3655ea70c4eef626bcb523cd4ed5bedb257f3f42a279cf39263f56f1226e
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 11348 bytes
SHA-256: 4e57e93d7c7a923e2410d2b7753654dcb595b185706c913da4cd4845444b23ae
font_02_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841