Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76b415f6e69e8eb…

MALICIOUS

PDF

97.1 KB Created: 2021-02-23 21:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d7b6f18d194ff7cdbc1c126fbbd8f24 SHA-1: f278d2e3b7f7c3991750e38d9014f7a7aa0a7e3c SHA-256: c76b415f6e69e8ebdd34b0a8d6c54e0e43c8fc67c2ea114ea00fe1f751845178
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF format and the nature of the heuristics strongly suggest an attempt to exploit users through malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=snowbear+trailer+weight+capacity PDF link annotation
    • http://legendbilisim.com/59680963794lj37a.pdfIn PDF document text
    • http://italylife.pro/2507225149pdkr9.pdfIn PDF document text
    • http://myfoxing.online/hit_songs_of_90_s_bollywood_listv8urc.pdfIn PDF document text
    • http://mufosozewolofar.iblogger.org/tajavukobodezab.pdfIn PDF document text
    • http://formverifiedbadge.com/present_simple_tense_test_with_answersnmcvk.pdfIn PDF document text
    • http://siankaanmexico.com/riwalowuzamaninaweniolphf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446038/normal_5ffe5af705c91.pdfIn PDF document text
    • https://gaxipisida.weebly.com/uploads/1/3/4/2/134267022/luditir.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/fewitugomesqpi2s.pdfIn PDF document text
    • http://mekozeka.66ghz.com/cremation_memorial_service_program_template.pdfIn PDF document text
    • http://select-get.top/12593967564i5p2h.pdfIn PDF document text
    • http://subaxidubuju.22web.org/aap_depression_screening_guidelines.pdfIn PDF document text
    • https://zefotuji.weebly.com/uploads/1/3/0/7/130738972/3203460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5fc7319c70006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/83856751288.pdfIn PDF document text
    • http://fidajakafitota.epizy.com/proximos_dias_festivos_en_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/sokekexeva.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_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 5456 bytes
SHA-256: b25c596fad3ca963b160ee40a263c3f1ba13b623ce479410bea937e2e63bfcce
font_01_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 12860 bytes
SHA-256: 4f15def2d6e8a4303af1515a4026516389071b5b3b4341b5ac25d9c8ab0fb18e
font_02_sfnt_off00015fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDA 16144 bytes
SHA-256: e0260c91544a2c419460cab41a31f9f40fe1482027d7e8fec03b90e8be50a0e3

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