Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d412c31bb2f853c…

MALICIOUS

PDF

75.0 KB Created: 2021-02-07 00:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 658c61e128809aee63b74ca8dbc93253 SHA-1: 4d3d244d9060d5d37197c14b20f4839315fb1af1 SHA-256: 7d412c31bb2f853cc8fdcd0bc733d9e13cd6c3531105faf430875c1ea4c2e2a8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=chinnari%20mutha%20kannada%20movie%20songs PDF link annotation
    • http://wersita.fun/savage_worlds_feuille_de_personnageikv6m.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/5141673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383928/normal_60038f76aa1b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5ff1ce9d827fc.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/6696357.pdfIn PDF document text
    • http://goldstein.capital/denarixagevetoturubpkdzz.pdfIn PDF document text
    • http://hookup154.fun/game_dragon_ball_legends_apkpure174c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ff0dea5f1ddf.pdfIn PDF document text
    • https://gozowejikagigu.weebly.com/uploads/1/3/5/3/135345496/37854d3ddbd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5ff0b5046f3bb.pdfIn PDF document text
    • http://tublitalia.space/xovomojupeviziwunoxipuy7z82.pdfIn PDF document text
    • http://rte-ita.fun/student_questions_for_fireworks_worksheet_2_answersuouuy.pdfIn PDF document text
    • http://sfr-espace.best/curriculo_pronto_primeiro_empregouart1.pdfIn PDF document text
    • http://hydrofthol.space/gonokefokosititasexexebx4hc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fe9d1f499c64.pdfIn PDF document text
    • http://tadinos.22web.org/jal_bathroom_fittings_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_6014f5cb2d044.pdfIn PDF document text
    • http://saudiautoinsurance.com/cacao_tree_informationchurd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5236 bytes
SHA-256: a2d58fa09304e25e7a0459984cfb2541eed04b9569156c9a7f944fb9c3ff8627
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 11200 bytes
SHA-256: ff5133c03a2cfd2ebc42dc4a486fadde459f63adafdd0935021b5bb23b97804b

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